diff --git a/internal/server/aof.go b/internal/server/aof.go
index 50263345..c8e8382d 100644
--- a/internal/server/aof.go
+++ b/internal/server/aof.go
@@ -122,7 +122,7 @@ func (server *Server) flushAOF() {
 	}
 }
 
-func (server *Server) writeAOF(args []string, d *commandDetailsT) error {
+func (server *Server) writeAOF(args []string, d *commandDetails) error {
 
 	if d != nil && !d.updated {
 		// just ignore writes if the command did not update
@@ -189,7 +189,7 @@ func (server *Server) writeAOF(args []string, d *commandDetailsT) error {
 	return nil
 }
 
-func (server *Server) queueHooks(d *commandDetailsT) error {
+func (server *Server) queueHooks(d *commandDetails) error {
 	// big list of all of the messages
 	var hmsgs []string
 	var hooks []*Hook
diff --git a/internal/server/crud.go b/internal/server/crud.go
index 089a25d3..e2a17933 100644
--- a/internal/server/crud.go
+++ b/internal/server/crud.go
@@ -293,7 +293,7 @@ func (server *Server) cmdGet(msg *Message) (resp.Value, error) {
 	return NOMessage, nil
 }
 
-func (server *Server) cmdDel(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdDel(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 	vs := msg.Args[1:]
 	var ok bool
@@ -337,7 +337,7 @@ func (server *Server) cmdDel(msg *Message) (res resp.Value, d commandDetailsT, e
 	return
 }
 
-func (server *Server) cmdPdel(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdPdel(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 	vs := msg.Args[1:]
 	var ok bool
@@ -356,7 +356,7 @@ func (server *Server) cmdPdel(msg *Message) (res resp.Value, d commandDetailsT,
 	now := time.Now()
 	iter := func(id string, o geojson.Object, fields []float64) bool {
 		if match, _ := glob.Match(d.pattern, id); match {
-			d.children = append(d.children, &commandDetailsT{
+			d.children = append(d.children, &commandDetails{
 				command:   "del",
 				updated:   true,
 				timestamp: now,
@@ -388,7 +388,7 @@ func (server *Server) cmdPdel(msg *Message) (res resp.Value, d commandDetailsT,
 			server.clearIDExpires(d.key, dc.id)
 		}
 		if atLeastOneNotDeleted {
-			var nchildren []*commandDetailsT
+			var nchildren []*commandDetails
 			for _, dc := range d.children {
 				if dc.command == "del" {
 					nchildren = append(nchildren, dc)
@@ -417,7 +417,7 @@ func (server *Server) cmdPdel(msg *Message) (res resp.Value, d commandDetailsT,
 	return
 }
 
-func (server *Server) cmdDrop(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdDrop(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 	vs := msg.Args[1:]
 	var ok bool
@@ -453,7 +453,7 @@ func (server *Server) cmdDrop(msg *Message) (res resp.Value, d commandDetailsT,
 	return
 }
 
-func (server *Server) cmdFlushDB(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdFlushDB(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 	vs := msg.Args[1:]
 	if len(vs) != 0 {
@@ -480,7 +480,7 @@ func (server *Server) cmdFlushDB(msg *Message) (res resp.Value, d commandDetails
 }
 
 func (server *Server) parseSetArgs(vs []string) (
-	d commandDetailsT, fields []string, values []float64,
+	d commandDetails, fields []string, values []float64,
 	xx, nx bool,
 	expires *float64, etype []byte, evs []string, err error,
 ) {
@@ -699,7 +699,7 @@ func (server *Server) parseSetArgs(vs []string) (
 	return
 }
 
-func (server *Server) cmdSet(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdSet(msg *Message) (res resp.Value, d commandDetails, err error) {
 	if server.config.maxMemory() > 0 && server.outOfMemory.on() {
 		err = errOOM
 		return
@@ -770,7 +770,7 @@ notok:
 }
 
 func (server *Server) parseFSetArgs(vs []string) (
-	d commandDetailsT, fields []string, values []float64, xx bool, err error,
+	d commandDetails, fields []string, values []float64, xx bool, err error,
 ) {
 	var ok bool
 	if vs, d.key, ok = tokenval(vs); !ok || d.key == "" {
@@ -812,7 +812,7 @@ func (server *Server) parseFSetArgs(vs []string) (
 	return
 }
 
-func (server *Server) cmdFset(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdFset(msg *Message) (res resp.Value, d commandDetails, err error) {
 	if server.config.maxMemory() > 0 && server.outOfMemory.on() {
 		err = errOOM
 		return
@@ -856,7 +856,7 @@ func (server *Server) cmdFset(msg *Message) (res resp.Value, d commandDetailsT,
 	return
 }
 
-func (server *Server) cmdExpire(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdExpire(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 	vs := msg.Args[1:]
 	var key, id, svalue string
@@ -910,7 +910,7 @@ func (server *Server) cmdExpire(msg *Message) (res resp.Value, d commandDetailsT
 	return
 }
 
-func (server *Server) cmdPersist(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (server *Server) cmdPersist(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 	vs := msg.Args[1:]
 	var key, id string
diff --git a/internal/server/dev.go b/internal/server/dev.go
index 7609ea1d..de071895 100644
--- a/internal/server/dev.go
+++ b/internal/server/dev.go
@@ -80,7 +80,7 @@ func (c *Server) cmdMassInsert(msg *Message) (res resp.Value, err error) {
 		nmsg := &Message{}
 		*nmsg = *msg
 		nmsg.Args = args
-		var d commandDetailsT
+		var d commandDetails
 		_, d, err = c.command(nmsg, nil)
 		if err != nil {
 			return err
diff --git a/internal/server/fence.go b/internal/server/fence.go
index 4fe67b19..93545e01 100644
--- a/internal/server/fence.go
+++ b/internal/server/fence.go
@@ -12,7 +12,7 @@ import (
 )
 
 // FenceMatch executes a fence match returns back json messages for fence detection.
-func FenceMatch(hookName string, sw *scanWriter, fence *liveFenceSwitches, metas []FenceMeta, details *commandDetailsT) []string {
+func FenceMatch(hookName string, sw *scanWriter, fence *liveFenceSwitches, metas []FenceMeta, details *commandDetails) []string {
 	msgs := fenceMatch(hookName, sw, fence, metas, details)
 	if len(fence.accept) == 0 {
 		return msgs
@@ -55,7 +55,7 @@ func hookJSONString(hookName string, metas []FenceMeta) string {
 }
 func fenceMatch(
 	hookName string, sw *scanWriter, fence *liveFenceSwitches,
-	metas []FenceMeta, details *commandDetailsT,
+	metas []FenceMeta, details *commandDetails,
 ) []string {
 	if details.command == "drop" {
 		return []string{
diff --git a/internal/server/hooks.go b/internal/server/hooks.go
index d155532a..29ac5a7b 100644
--- a/internal/server/hooks.go
+++ b/internal/server/hooks.go
@@ -36,7 +36,7 @@ func (a hooksByName) Swap(i, j int) {
 }
 
 func (c *Server) cmdSetHook(msg *Message, chanCmd bool) (
-	res resp.Value, d commandDetailsT, err error,
+	res resp.Value, d commandDetails, err error,
 ) {
 	start := time.Now()
 	vs := msg.Args[1:]
@@ -204,7 +204,7 @@ func (c *Server) cmdSetHook(msg *Message, chanCmd bool) (
 }
 
 func (c *Server) cmdDelHook(msg *Message, chanCmd bool) (
-	res resp.Value, d commandDetailsT, err error,
+	res resp.Value, d commandDetails, err error,
 ) {
 	start := time.Now()
 	vs := msg.Args[1:]
@@ -240,7 +240,7 @@ func (c *Server) cmdDelHook(msg *Message, chanCmd bool) (
 }
 
 func (c *Server) cmdPDelHook(msg *Message, channel bool) (
-	res resp.Value, d commandDetailsT, err error,
+	res resp.Value, d commandDetails, err error,
 ) {
 	start := time.Now()
 	vs := msg.Args[1:]
diff --git a/internal/server/json.go b/internal/server/json.go
index fb8b0cb7..8706dbb8 100644
--- a/internal/server/json.go
+++ b/internal/server/json.go
@@ -156,7 +156,7 @@ func (c *Server) cmdJget(msg *Message) (resp.Value, error) {
 	return NOMessage, nil
 }
 
-func (c *Server) cmdJset(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (c *Server) cmdJset(msg *Message) (res resp.Value, d commandDetails, err error) {
 	// JSET key path value [RAW]
 	start := time.Now()
 
@@ -248,7 +248,7 @@ func (c *Server) cmdJset(msg *Message) (res resp.Value, d commandDetailsT, err e
 	return NOMessage, d, nil
 }
 
-func (c *Server) cmdJdel(msg *Message) (res resp.Value, d commandDetailsT, err error) {
+func (c *Server) cmdJdel(msg *Message) (res resp.Value, d commandDetails, err error) {
 	start := time.Now()
 
 	if len(msg.Args) != 4 {
diff --git a/internal/server/live.go b/internal/server/live.go
index 042e071e..7ba0c7d1 100644
--- a/internal/server/live.go
+++ b/internal/server/live.go
@@ -15,7 +15,7 @@ type liveBuffer struct {
 	key     string
 	glob    string
 	fence   *liveFenceSwitches
-	details []*commandDetailsT
+	details []*commandDetails
 	cond    *sync.Cond
 }
 
diff --git a/internal/server/scripts.go b/internal/server/scripts.go
index f5473a93..13832fbd 100644
--- a/internal/server/scripts.go
+++ b/internal/server/scripts.go
@@ -558,7 +558,7 @@ func (c *Server) cmdScriptFlush(msg *Message) (resp.Value, error) {
 }
 
 func (c *Server) commandInScript(msg *Message) (
-	res resp.Value, d commandDetailsT, err error,
+	res resp.Value, d commandDetails, err error,
 ) {
 	switch msg.Command() {
 	default:
diff --git a/internal/server/server.go b/internal/server/server.go
index 9e208794..6707e03f 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -38,26 +38,26 @@ import (
 
 var errOOM = errors.New("OOM command not allowed when used memory > 'maxmemory'")
 
-const goingLive = "going live"
+const (
+	goingLive     = "going live"
+	hookLogPrefix = "hook:log:"
+)
 
-const hookLogPrefix = "hook:log:"
-
-type commandDetailsT struct {
-	command   string
-	key, id   string
-	field     string
-	value     float64
-	obj       geojson.Object
-	fields    []float64
-	fmap      map[string]int
-	oldObj    geojson.Object
-	oldFields []float64
-	updated   bool
-	timestamp time.Time
-
-	parent   bool               // when true, only children are forwarded
-	pattern  string             // PDEL key pattern
-	children []*commandDetailsT // for multi actions such as "PDEL"
+// commandDetails is detailed information about a mutable command. It's used
+// for geofence formulas.
+type commandDetails struct {
+	command   string            // client command, like "SET" or "DEL"
+	key, id   string            // collection key and object id of object
+	fmap      map[string]int    // map of field names to value indexes
+	obj       geojson.Object    // new object
+	fields    []float64         // array of field values
+	oldObj    geojson.Object    // previous object, if any
+	oldFields []float64         // previous object field values
+	updated   bool              // object was updated
+	timestamp time.Time         // timestamp when the update occured
+	parent    bool              // when true, only children are forwarded
+	pattern   string            // PDEL key pattern
+	children  []*commandDetails // for multi actions such as "PDEL"
 }
 
 // Server is a tile38 controller
@@ -101,7 +101,7 @@ type Server struct {
 
 	follows    map[*bytes.Buffer]bool
 	fcond      *sync.Cond
-	lstack     []*commandDetailsT
+	lstack     []*commandDetails
 	lives      map[*liveBuffer]bool
 	lcond      *sync.Cond
 	fcup       bool                        // follow caught up
@@ -1053,7 +1053,7 @@ func (server *Server) reset() {
 }
 
 func (server *Server) command(msg *Message, client *Client) (
-	res resp.Value, d commandDetailsT, err error,
+	res resp.Value, d commandDetails, err error,
 ) {
 	switch msg.Command() {
 	default: