diff --git a/coverage_test.go b/coverage_test.go
index bc94e55..6fbbecc 100644
--- a/coverage_test.go
+++ b/coverage_test.go
@@ -18,6 +18,7 @@ func uint32ptr(v uint32) *uint32    { return &v }
 func uint64ptr(v uint64) *uint64    { return &v }
 func float32ptr(v float32) *float32 { return &v }
 func float64ptr(v float64) *float64 { return &v }
+func stringptr(v string) *string    { return &v }
 
 func TestCoverStructHeadInt(t *testing.T) {
 	type structInt struct {
@@ -7472,3 +7473,624 @@ func TestCoverStructHeadFloat64(t *testing.T) {
 		}
 	}
 }
+
+func TestCoverStructHeadString(t *testing.T) {
+	type structString struct {
+		A string `json:"a"`
+	}
+	type structStringPtr struct {
+		A *string `json:"a"`
+	}
+
+	tests := []struct {
+		name     string
+		expected string
+		data     interface{}
+	}{
+		{
+			name:     "HeadStringZero",
+			expected: `{"a":""}`,
+			data: struct {
+				A string `json:"a"`
+			}{},
+		},
+		{
+			name:     "HeadString",
+			expected: `{"a":"foo"}`,
+			data: struct {
+				A string `json:"a"`
+			}{A: "foo"},
+		},
+		{
+			name:     "HeadStringPtr",
+			expected: `{"a":"foo"}`,
+			data: struct {
+				A *string `json:"a"`
+			}{A: stringptr("foo")},
+		},
+		{
+			name:     "HeadStringPtrNil",
+			expected: `{"a":null}`,
+			data: struct {
+				A *string `json:"a"`
+			}{A: nil},
+		},
+		{
+			name:     "PtrHeadStringZero",
+			expected: `{"a":""}`,
+			data: &struct {
+				A string `json:"a"`
+			}{},
+		},
+		{
+			name:     "PtrHeadString",
+			expected: `{"a":"foo"}`,
+			data: &struct {
+				A string `json:"a"`
+			}{A: "foo"},
+		},
+		{
+			name:     "PtrHeadStringPtr",
+			expected: `{"a":"foo"}`,
+			data: &struct {
+				A *string `json:"a"`
+			}{A: stringptr("foo")},
+		},
+		{
+			name:     "PtrHeadStringPtrNil",
+			expected: `{"a":null}`,
+			data: &struct {
+				A *string `json:"a"`
+			}{A: nil},
+		},
+		{
+			name:     "PtrHeadStringNil",
+			expected: `null`,
+			data: (*struct {
+				A *string `json:"a"`
+			})(nil),
+		},
+		{
+			name:     "HeadStringZeroMultiFields",
+			expected: `{"a":"","b":""}`,
+			data: struct {
+				A string `json:"a"`
+				B string `json:"b"`
+			}{},
+		},
+		{
+			name:     "HeadStringMultiFields",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: struct {
+				A string `json:"a"`
+				B string `json:"b"`
+			}{A: "foo", B: "bar"},
+		},
+		{
+			name:     "HeadStringPtrMultiFields",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			}{A: stringptr("foo"), B: stringptr("bar")},
+		},
+		{
+			name:     "HeadStringPtrNilMultiFields",
+			expected: `{"a":null,"b":null}`,
+			data: struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			}{A: nil, B: nil},
+		},
+		{
+			name:     "PtrHeadStringZeroMultiFields",
+			expected: `{"a":"","b":""}`,
+			data: &struct {
+				A string `json:"a"`
+				B string `json:"b"`
+			}{},
+		},
+		{
+			name:     "PtrHeadStringMultiFields",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: &struct {
+				A string `json:"a"`
+				B string `json:"b"`
+			}{A: "foo", B: "bar"},
+		},
+		{
+			name:     "PtrHeadStringPtrMultiFields",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: &struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			}{A: stringptr("foo"), B: stringptr("bar")},
+		},
+		{
+			name:     "PtrHeadStringPtrNilMultiFields",
+			expected: `{"a":null,"b":null}`,
+			data: &struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			}{A: nil, B: nil},
+		},
+		{
+			name:     "PtrHeadStringNilMultiFields",
+			expected: `null`,
+			data: (*struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			})(nil),
+		},
+		{
+			name:     "HeadStringZeroNotRoot",
+			expected: `{"A":{"a":""}}`,
+			data: struct {
+				A struct {
+					A string `json:"a"`
+				}
+			}{},
+		},
+		{
+			name:     "HeadStringNotRoot",
+			expected: `{"A":{"a":"foo"}}`,
+			data: struct {
+				A struct {
+					A string `json:"a"`
+				}
+			}{A: struct {
+				A string `json:"a"`
+			}{A: "foo"}},
+		},
+		{
+			name:     "HeadStringPtrNotRoot",
+			expected: `{"A":{"a":"foo"}}`,
+			data: struct {
+				A struct {
+					A *string `json:"a"`
+				}
+			}{A: struct {
+				A *string `json:"a"`
+			}{stringptr("foo")}},
+		},
+		{
+			name:     "HeadStringPtrNilNotRoot",
+			expected: `{"A":{"a":null}}`,
+			data: struct {
+				A struct {
+					A *string `json:"a"`
+				}
+			}{},
+		},
+		{
+			name:     "PtrHeadStringZeroNotRoot",
+			expected: `{"A":{"a":""}}`,
+			data: struct {
+				A *struct {
+					A string `json:"a"`
+				}
+			}{A: new(struct {
+				A string `json:"a"`
+			})},
+		},
+		{
+			name:     "PtrHeadStringNotRoot",
+			expected: `{"A":{"a":"foo"}}`,
+			data: struct {
+				A *struct {
+					A string `json:"a"`
+				}
+			}{A: &(struct {
+				A string `json:"a"`
+			}{A: "foo"})},
+		},
+		{
+			name:     "PtrHeadStringPtrNotRoot",
+			expected: `{"A":{"a":"foo"}}`,
+			data: struct {
+				A *struct {
+					A *string `json:"a"`
+				}
+			}{A: &(struct {
+				A *string `json:"a"`
+			}{A: stringptr("foo")})},
+		},
+		{
+			name:     "PtrHeadStringPtrNilNotRoot",
+			expected: `{"A":{"a":null}}`,
+			data: struct {
+				A *struct {
+					A *string `json:"a"`
+				}
+			}{A: &(struct {
+				A *string `json:"a"`
+			}{A: nil})},
+		},
+		{
+			name:     "PtrHeadStringNilNotRoot",
+			expected: `{"A":null}`,
+			data: struct {
+				A *struct {
+					A *string `json:"a"`
+				}
+			}{A: nil},
+		},
+		{
+			name:     "HeadStringZeroMultiFieldsNotRoot",
+			expected: `{"A":{"a":""},"B":{"b":""}}`,
+			data: struct {
+				A struct {
+					A string `json:"a"`
+				}
+				B struct {
+					B string `json:"b"`
+				}
+			}{},
+		},
+		{
+			name:     "HeadStringMultiFieldsNotRoot",
+			expected: `{"A":{"a":"foo"},"B":{"b":"bar"}}`,
+			data: struct {
+				A struct {
+					A string `json:"a"`
+				}
+				B struct {
+					B string `json:"b"`
+				}
+			}{A: struct {
+				A string `json:"a"`
+			}{A: "foo"}, B: struct {
+				B string `json:"b"`
+			}{B: "bar"}},
+		},
+		{
+			name:     "HeadStringPtrMultiFieldsNotRoot",
+			expected: `{"A":{"a":"foo"},"B":{"b":"bar"}}`,
+			data: struct {
+				A struct {
+					A *string `json:"a"`
+				}
+				B struct {
+					B *string `json:"b"`
+				}
+			}{A: struct {
+				A *string `json:"a"`
+			}{A: stringptr("foo")}, B: struct {
+				B *string `json:"b"`
+			}{B: stringptr("bar")}},
+		},
+		{
+			name:     "HeadStringPtrNilMultiFieldsNotRoot",
+			expected: `{"A":{"a":null},"B":{"b":null}}`,
+			data: struct {
+				A struct {
+					A *string `json:"a"`
+				}
+				B struct {
+					B *string `json:"b"`
+				}
+			}{A: struct {
+				A *string `json:"a"`
+			}{A: nil}, B: struct {
+				B *string `json:"b"`
+			}{B: nil}},
+		},
+		{
+			name:     "PtrHeadStringZeroMultiFieldsNotRoot",
+			expected: `{"A":{"a":""},"B":{"b":""}}`,
+			data: &struct {
+				A struct {
+					A string `json:"a"`
+				}
+				B struct {
+					B string `json:"b"`
+				}
+			}{},
+		},
+		{
+			name:     "PtrHeadStringMultiFieldsNotRoot",
+			expected: `{"A":{"a":"foo"},"B":{"b":"bar"}}`,
+			data: &struct {
+				A struct {
+					A string `json:"a"`
+				}
+				B struct {
+					B string `json:"b"`
+				}
+			}{A: struct {
+				A string `json:"a"`
+			}{A: "foo"}, B: struct {
+				B string `json:"b"`
+			}{B: "bar"}},
+		},
+		{
+			name:     "PtrHeadStringPtrMultiFieldsNotRoot",
+			expected: `{"A":{"a":"foo"},"B":{"b":"bar"}}`,
+			data: &struct {
+				A *struct {
+					A *string `json:"a"`
+				}
+				B *struct {
+					B *string `json:"b"`
+				}
+			}{A: &(struct {
+				A *string `json:"a"`
+			}{A: stringptr("foo")}), B: &(struct {
+				B *string `json:"b"`
+			}{B: stringptr("bar")})},
+		},
+		{
+			name:     "PtrHeadStringPtrNilMultiFieldsNotRoot",
+			expected: `{"A":null,"B":null}`,
+			data: &struct {
+				A *struct {
+					A *string `json:"a"`
+				}
+				B *struct {
+					B *string `json:"b"`
+				}
+			}{A: nil, B: nil},
+		},
+		{
+			name:     "PtrHeadStringNilMultiFieldsNotRoot",
+			expected: `null`,
+			data: (*struct {
+				A *struct {
+					A *string `json:"a"`
+				}
+				B *struct {
+					B *string `json:"b"`
+				}
+			})(nil),
+		},
+		{
+			name:     "PtrHeadStringDoubleMultiFieldsNotRoot",
+			expected: `{"A":{"a":"foo","b":"bar"},"B":{"a":"foo","b":"bar"}}`,
+			data: &struct {
+				A *struct {
+					A string `json:"a"`
+					B string `json:"b"`
+				}
+				B *struct {
+					A string `json:"a"`
+					B string `json:"b"`
+				}
+			}{A: &(struct {
+				A string `json:"a"`
+				B string `json:"b"`
+			}{A: "foo", B: "bar"}), B: &(struct {
+				A string `json:"a"`
+				B string `json:"b"`
+			}{A: "foo", B: "bar"})},
+		},
+		{
+			name:     "PtrHeadStringNilDoubleMultiFieldsNotRoot",
+			expected: `{"A":null,"B":null}`,
+			data: &struct {
+				A *struct {
+					A string `json:"a"`
+					B string `json:"b"`
+				}
+				B *struct {
+					A string `json:"a"`
+					B string `json:"b"`
+				}
+			}{A: nil, B: nil},
+		},
+		{
+			name:     "PtrHeadStringNilDoubleMultiFieldsNotRoot",
+			expected: `null`,
+			data: (*struct {
+				A *struct {
+					A string `json:"a"`
+					B string `json:"b"`
+				}
+				B *struct {
+					A string `json:"a"`
+					B string `json:"b"`
+				}
+			})(nil),
+		},
+		{
+			name:     "PtrHeadStringPtrDoubleMultiFieldsNotRoot",
+			expected: `{"A":{"a":"foo","b":"bar"},"B":{"a":"foo","b":"bar"}}`,
+			data: &struct {
+				A *struct {
+					A *string `json:"a"`
+					B *string `json:"b"`
+				}
+				B *struct {
+					A *string `json:"a"`
+					B *string `json:"b"`
+				}
+			}{A: &(struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			}{A: stringptr("foo"), B: stringptr("bar")}), B: &(struct {
+				A *string `json:"a"`
+				B *string `json:"b"`
+			}{A: stringptr("foo"), B: stringptr("bar")})},
+		},
+		{
+			name:     "PtrHeadStringPtrNilDoubleMultiFieldsNotRoot",
+			expected: `{"A":null,"B":null}`,
+			data: &struct {
+				A *struct {
+					A *string `json:"a"`
+					B *string `json:"b"`
+				}
+				B *struct {
+					A *string `json:"a"`
+					B *string `json:"b"`
+				}
+			}{A: nil, B: nil},
+		},
+		{
+			name:     "PtrHeadStringPtrNilDoubleMultiFieldsNotRoot",
+			expected: `null`,
+			data: (*struct {
+				A *struct {
+					A *string `json:"a"`
+					B *string `json:"b"`
+				}
+				B *struct {
+					A *string `json:"a"`
+					B *string `json:"b"`
+				}
+			})(nil),
+		},
+		{
+			name:     "AnonymousHeadString",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: struct {
+				structString
+				B string `json:"b"`
+			}{
+				structString: structString{A: "foo"},
+				B:            "bar",
+			},
+		},
+		{
+			name:     "PtrAnonymousHeadString",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: struct {
+				*structString
+				B string `json:"b"`
+			}{
+				structString: &structString{A: "foo"},
+				B:            "bar",
+			},
+		},
+		{
+			name:     "NilPtrAnonymousHeadString",
+			expected: `{"b":"baz"}`,
+			data: struct {
+				*structString
+				B string `json:"b"`
+			}{
+				structString: nil,
+				B:            "baz",
+			},
+		},
+		{
+			name:     "AnonymousHeadStringPtr",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: struct {
+				structStringPtr
+				B *string `json:"b"`
+			}{
+				structStringPtr: structStringPtr{A: stringptr("foo")},
+				B:               stringptr("bar"),
+			},
+		},
+		{
+			name:     "AnonymousHeadStringPtrNil",
+			expected: `{"a":null,"b":"foo"}`,
+			data: struct {
+				structStringPtr
+				B *string `json:"b"`
+			}{
+				structStringPtr: structStringPtr{A: nil},
+				B:               stringptr("foo"),
+			},
+		},
+		{
+			name:     "PtrAnonymousHeadStringPtr",
+			expected: `{"a":"foo","b":"bar"}`,
+			data: struct {
+				*structStringPtr
+				B *string `json:"b"`
+			}{
+				structStringPtr: &structStringPtr{A: stringptr("foo")},
+				B:               stringptr("bar"),
+			},
+		},
+		{
+			name:     "NilPtrAnonymousHeadStringPtr",
+			expected: `{"b":"foo"}`,
+			data: struct {
+				*structStringPtr
+				B *string `json:"b"`
+			}{
+				structStringPtr: nil,
+				B:               stringptr("foo"),
+			},
+		},
+		{
+			name:     "AnonymousHeadStringOnly",
+			expected: `{"a":"foo"}`,
+			data: struct {
+				structString
+			}{
+				structString: structString{A: "foo"},
+			},
+		},
+		{
+			name:     "PtrAnonymousHeadStringOnly",
+			expected: `{"a":"foo"}`,
+			data: struct {
+				*structString
+			}{
+				structString: &structString{A: "foo"},
+			},
+		},
+		{
+			name:     "NilPtrAnonymousHeadStringOnly",
+			expected: `{}`,
+			data: struct {
+				*structString
+			}{
+				structString: nil,
+			},
+		},
+		{
+			name:     "AnonymousHeadStringPtrOnly",
+			expected: `{"a":"foo"}`,
+			data: struct {
+				structStringPtr
+			}{
+				structStringPtr: structStringPtr{A: stringptr("foo")},
+			},
+		},
+		{
+			name:     "AnonymousHeadStringPtrNilOnly",
+			expected: `{"a":null}`,
+			data: struct {
+				structStringPtr
+			}{
+				structStringPtr: structStringPtr{A: nil},
+			},
+		},
+		{
+			name:     "PtrAnonymousHeadStringPtrOnly",
+			expected: `{"a":"foo"}`,
+			data: struct {
+				*structStringPtr
+			}{
+				structStringPtr: &structStringPtr{A: stringptr("foo")},
+			},
+		},
+		{
+			name:     "NilPtrAnonymousHeadStringPtrOnly",
+			expected: `{}`,
+			data: struct {
+				*structStringPtr
+			}{
+				structStringPtr: nil,
+			},
+		},
+	}
+	for _, test := range tests {
+		for _, htmlEscape := range []bool{true, false} {
+			var buf bytes.Buffer
+			enc := NewEncoder(&buf)
+			enc.SetEscapeHTML(htmlEscape)
+			if err := enc.Encode(test.data); err != nil {
+				t.Fatalf("%s(htmlEscape:%T): %s: %s", test.name, htmlEscape, test.expected, err)
+			}
+			if strings.TrimRight(buf.String(), "\n") != test.expected {
+				t.Fatalf("%s(htmlEscape:%T): expected %q but got %q", test.name, htmlEscape, test.expected, buf.String())
+			}
+		}
+	}
+}
diff --git a/encode_vm.go b/encode_vm.go
index 682e853..d9eed79 100644
--- a/encode_vm.go
+++ b/encode_vm.go
@@ -4395,24 +4395,13 @@ func (e *Encoder) run(ctx *encodeRuntimeContext, b []byte, code *opcode) ([]byte
 			b = encodeComma(b)
 			code = code.next
 		case opStructFieldPtrHeadString:
-			p := load(ctxptr, code.idx)
-			if p == 0 {
-				b = encodeNull(b)
-				b = encodeComma(b)
-				code = code.end.next
-				break
-			}
-			store(ctxptr, code.idx, e.ptrToPtr(p))
+			store(ctxptr, code.idx, e.ptrToPtr(load(ctxptr, code.idx)))
 			fallthrough
 		case opStructFieldHeadString:
 			ptr := load(ctxptr, code.idx)
 			if ptr == 0 {
-				if code.op == opStructFieldPtrHeadString {
-					b = encodeNull(b)
-					b = encodeComma(b)
-				} else {
-					b = append(b, '{', '}', ',')
-				}
+				b = encodeNull(b)
+				b = encodeComma(b)
 				code = code.end.next
 			} else {
 				b = append(b, '{')
@@ -4421,20 +4410,11 @@ func (e *Encoder) run(ctx *encodeRuntimeContext, b []byte, code *opcode) ([]byte
 				b = encodeComma(b)
 				code = code.next
 			}
-		case opStructFieldPtrHeadStringOnly:
+		case opStructFieldPtrHeadStringOnly, opStructFieldHeadStringOnly:
 			p := load(ctxptr, code.idx)
-			if p == 0 {
-				b = encodeNull(b)
-				b = encodeComma(b)
-				code = code.end.next
-				break
-			}
-			fallthrough
-		case opStructFieldHeadStringOnly:
-			ptr := load(ctxptr, code.idx)
 			b = append(b, '{')
 			b = append(b, code.key...)
-			b = encodeEscapedString(b, e.ptrToString(ptr+code.offset))
+			b = encodeNoEscapedString(b, e.ptrToString(p))
 			b = encodeComma(b)
 			code = code.next
 		case opStructEscapedFieldPtrHeadEscapedString:
@@ -4450,12 +4430,8 @@ func (e *Encoder) run(ctx *encodeRuntimeContext, b []byte, code *opcode) ([]byte
 		case opStructEscapedFieldHeadEscapedString:
 			ptr := load(ctxptr, code.idx)
 			if ptr == 0 {
-				if code.op == opStructEscapedFieldPtrHeadEscapedString {
-					b = encodeNull(b)
-					b = encodeComma(b)
-				} else {
-					b = append(b, '{', '}', ',')
-				}
+				b = encodeNull(b)
+				b = encodeComma(b)
 				code = code.end.next
 			} else {
 				b = append(b, '{')
@@ -4464,7 +4440,36 @@ func (e *Encoder) run(ctx *encodeRuntimeContext, b []byte, code *opcode) ([]byte
 				b = encodeComma(b)
 				code = code.next
 			}
-		case opStructEscapedFieldPtrHeadEscapedStringOnly:
+		case opStructEscapedFieldPtrHeadEscapedStringOnly, opStructEscapedFieldHeadEscapedStringOnly:
+			p := load(ctxptr, code.idx)
+			b = append(b, '{')
+			b = append(b, code.escapedKey...)
+			b = encodeEscapedString(b, e.ptrToString(p+code.offset))
+			b = encodeComma(b)
+			code = code.next
+		case opStructFieldPtrHeadStringPtr:
+			store(ctxptr, code.idx, e.ptrToPtr(load(ctxptr, code.idx)))
+			fallthrough
+		case opStructFieldHeadStringPtr:
+			p := load(ctxptr, code.idx)
+			if p == 0 {
+				b = encodeNull(b)
+				b = encodeComma(b)
+				code = code.end.next
+				break
+			} else {
+				b = append(b, '{')
+				b = append(b, code.key...)
+				p = e.ptrToPtr(p)
+				if p == 0 {
+					b = encodeNull(b)
+				} else {
+					b = encodeNoEscapedString(b, e.ptrToString(p+code.offset))
+				}
+			}
+			b = encodeComma(b)
+			code = code.next
+		case opStructFieldPtrHeadStringPtrOnly:
 			p := load(ctxptr, code.idx)
 			if p == 0 {
 				b = encodeNull(b)
@@ -4472,12 +4477,60 @@ func (e *Encoder) run(ctx *encodeRuntimeContext, b []byte, code *opcode) ([]byte
 				code = code.end.next
 				break
 			}
+			store(ctxptr, code.idx, e.ptrToPtr(p))
 			fallthrough
-		case opStructEscapedFieldHeadEscapedStringOnly:
-			ptr := load(ctxptr, code.idx)
+		case opStructFieldHeadStringPtrOnly:
+			p := load(ctxptr, code.idx)
+			b = append(b, '{')
+			b = append(b, code.key...)
+			if p == 0 {
+				b = encodeNull(b)
+			} else {
+				b = encodeNoEscapedString(b, e.ptrToString(p+code.offset))
+			}
+			b = encodeComma(b)
+			code = code.next
+		case opStructEscapedFieldPtrHeadEscapedStringPtr:
+			store(ctxptr, code.idx, e.ptrToPtr(load(ctxptr, code.idx)))
+			fallthrough
+		case opStructEscapedFieldHeadEscapedStringPtr:
+			p := load(ctxptr, code.idx)
+			if p == 0 {
+				b = encodeNull(b)
+				b = encodeComma(b)
+				code = code.end.next
+				break
+			} else {
+				b = append(b, '{')
+				b = append(b, code.escapedKey...)
+				p = e.ptrToPtr(p)
+				if p == 0 {
+					b = encodeNull(b)
+				} else {
+					b = encodeEscapedString(b, e.ptrToString(p+code.offset))
+				}
+			}
+			b = encodeComma(b)
+			code = code.next
+		case opStructEscapedFieldPtrHeadEscapedStringPtrOnly:
+			p := load(ctxptr, code.idx)
+			if p == 0 {
+				b = encodeNull(b)
+				b = encodeComma(b)
+				code = code.end.next
+				break
+			}
+			store(ctxptr, code.idx, e.ptrToPtr(p))
+			fallthrough
+		case opStructEscapedFieldHeadEscapedStringPtrOnly:
+			p := load(ctxptr, code.idx)
 			b = append(b, '{')
 			b = append(b, code.escapedKey...)
-			b = encodeEscapedString(b, e.ptrToString(ptr+code.offset))
+			if p == 0 {
+				b = encodeNull(b)
+			} else {
+				b = encodeEscapedString(b, e.ptrToString(p+code.offset))
+			}
 			b = encodeComma(b)
 			code = code.next
 		case opStructFieldPtrAnonymousHeadString:
@@ -4506,18 +4559,96 @@ func (e *Encoder) run(ctx *encodeRuntimeContext, b []byte, code *opcode) ([]byte
 				b = encodeComma(b)
 				code = code.next
 			}
-
-		case opStructEscapedFieldPtrAnonymousHeadEscapedStringOnly:
+		case opStructFieldPtrAnonymousHeadStringOnly, opStructFieldAnonymousHeadStringOnly:
+			ptr := load(ctxptr, code.idx)
+			if ptr == 0 {
+				code = code.end.next
+			} else {
+				b = append(b, code.key...)
+				b = encodeNoEscapedString(b, e.ptrToString(ptr+code.offset))
+				b = encodeComma(b)
+				code = code.next
+			}
+		case opStructEscapedFieldPtrAnonymousHeadEscapedStringOnly, opStructEscapedFieldAnonymousHeadEscapedStringOnly:
+			ptr := load(ctxptr, code.idx)
+			if ptr == 0 {
+				code = code.end.next
+			} else {
+				b = append(b, code.escapedKey...)
+				b = encodeEscapedString(b, e.ptrToString(ptr+code.offset))
+				b = encodeComma(b)
+				code = code.next
+			}
+		case opStructFieldPtrAnonymousHeadStringPtr:
+			store(ctxptr, code.idx, e.ptrToPtr(load(ctxptr, code.idx)))
+			fallthrough
+		case opStructFieldAnonymousHeadStringPtr:
 			p := load(ctxptr, code.idx)
 			if p == 0 {
 				code = code.end.next
 				break
 			}
+			b = append(b, code.key...)
+			p = e.ptrToPtr(p)
+			if p == 0 {
+				b = encodeNull(b)
+			} else {
+				b = encodeNoEscapedString(b, e.ptrToString(p+code.offset))
+			}
+			b = encodeComma(b)
+			code = code.next
+		case opStructEscapedFieldPtrAnonymousHeadEscapedStringPtr:
+			store(ctxptr, code.idx, e.ptrToPtr(load(ctxptr, code.idx)))
 			fallthrough
-		case opStructEscapedFieldAnonymousHeadEscapedStringOnly:
+		case opStructEscapedFieldAnonymousHeadEscapedStringPtr:
+			p := load(ctxptr, code.idx)
+			if p == 0 {
+				code = code.end.next
+				break
+			}
+			b = append(b, code.escapedKey...)
+			p = e.ptrToPtr(p)
+			if p == 0 {
+				b = encodeNull(b)
+			} else {
+				b = encodeEscapedString(b, e.ptrToString(p+code.offset))
+			}
+			b = encodeComma(b)
+			code = code.next
+		case opStructFieldPtrAnonymousHeadStringPtrOnly:
+			p := load(ctxptr, code.idx)
+			if p == 0 {
+				code = code.end.next
+				break
+			}
+			store(ctxptr, code.idx, e.ptrToPtr(p))
+			fallthrough
+		case opStructFieldAnonymousHeadStringPtrOnly:
+			p := load(ctxptr, code.idx)
+			b = append(b, code.key...)
+			if p == 0 {
+				b = encodeNull(b)
+			} else {
+				b = encodeNoEscapedString(b, e.ptrToString(p+code.offset))
+			}
+			b = encodeComma(b)
+			code = code.next
+		case opStructEscapedFieldPtrAnonymousHeadEscapedStringPtrOnly:
+			p := load(ctxptr, code.idx)
+			if p == 0 {
+				code = code.end.next
+				break
+			}
+			store(ctxptr, code.idx, e.ptrToPtr(p))
+			fallthrough
+		case opStructEscapedFieldAnonymousHeadEscapedStringPtrOnly:
 			p := load(ctxptr, code.idx)
 			b = append(b, code.escapedKey...)
-			b = encodeEscapedString(b, e.ptrToString(p+code.offset))
+			if p == 0 {
+				b = encodeNull(b)
+			} else {
+				b = encodeEscapedString(b, e.ptrToString(p+code.offset))
+			}
 			b = encodeComma(b)
 			code = code.next
 		case opStructFieldPtrHeadBool: