diff --git a/cast_test.go b/cast_test.go
index dc8ba14..afb7d1b 100644
--- a/cast_test.go
+++ b/cast_test.go
@@ -56,6 +56,8 @@ func createNumberTestSteps(zero, one, eight, eightnegative, eightpoint31, eightp
 		{uint64(8), eight, false},
 		{float32(8.31), eightpoint31_32, false},
 		{float64(8.31), eightpoint31, false},
+		{"8.31", eightpoint31_32, false},
+		{"8.31", eightpoint31, false},
 		{true, one, false},
 		{false, zero, false},
 		{"8", eight, false},
@@ -67,6 +69,8 @@ func createNumberTestSteps(zero, one, eight, eightnegative, eightpoint31, eightp
 		{int64(-8), eightnegative, isUint},
 		{float32(-8.31), eightpoint31negative_32, isUint},
 		{float64(-8.31), eightpoint31negative, isUint},
+		{"-8.31", eightpoint31negative_32, isUint},
+		{"-8.31", eightpoint31negative, isUint},
 		{"-8", eightnegative, isUint},
 		{jeight, eight, false},
 		{jminuseight, eightnegative, isUint},