diff --git a/parse/api.go b/parse/api.go
index 14c7016..1a8d758 100644
--- a/parse/api.go
+++ b/parse/api.go
@@ -26,7 +26,7 @@ type API struct {
 // If it does, then true will be returned, false otherwise. The read cursor
 // will be kept at the same position, so the next call to Peek() or Accept()
 // will start from the same cursor position.
-func (p *API) Peek(tokenHandler tokenize.Handler) bool {
+func (p *API) PeekWithResult(tokenHandler tokenize.Handler) bool {
 	forkedAPI, ok := p.invokeHandler("Peek", tokenHandler)
 	t := p.tokenAPI
 	if ok {
@@ -37,6 +37,15 @@ func (p *API) Peek(tokenHandler tokenize.Handler) bool {
 	return ok
 }
 
+func (p *API) Peek(tokenHandler tokenize.Handler) bool {
+	forkedAPI, ok := p.invokeHandler("Peek", tokenHandler)
+	t := p.tokenAPI
+	p.Result.Tokens = nil
+	p.Result.Runes = nil
+	t.Dispose(forkedAPI)
+	return ok
+}
+
 // Accept checks if the upcoming input data matches the provided tokenize.Handler.
 // If it does, then true will be returned and the read cursor will be moved
 // forward to beyond the match that was found. Otherwise false will be
diff --git a/tokenize/api.go b/tokenize/api.go
index 580889c..d0192cf 100644
--- a/tokenize/api.go
+++ b/tokenize/api.go
@@ -136,22 +136,21 @@ func NewAPI(input interface{}) *API {
 // The parent API was never modified, so it can safely be used after disposal
 // as if the lookahead never happened.
 func (tokenAPI *API) Fork() int {
-	newStackLevel := tokenAPI.stackLevel + 1
-	newStackSize := newStackLevel + 1
+	tokenAPI.stackLevel++
+	newStackLevel := tokenAPI.stackLevel
 
 	// Grow the stack frames capacity when needed.
-	if cap(tokenAPI.stackFrames) < newStackSize {
-		newFrames := make([]stackFrame, newStackSize*2)
-		copy(newFrames, tokenAPI.stackFrames)
-		tokenAPI.stackFrames = newFrames
+	frames := tokenAPI.stackFrames
+	if cap(frames) < (newStackLevel + 1) {
+		newFrames := make([]stackFrame, (newStackLevel+1)*2)
+		copy(newFrames, frames)
+		frames = newFrames
 	}
 
-	tokenAPI.stackLevel++
-
 	// This can be written in a shorter way, but this turned out to
 	// be the best way performance-wise.
 	parent := tokenAPI.stackFrame
-	child := &tokenAPI.stackFrames[tokenAPI.stackLevel]
+	child := &frames[newStackLevel]
 	child.offset = parent.offset
 	child.column = parent.column
 	child.line = parent.line
@@ -161,7 +160,7 @@ func (tokenAPI *API) Fork() int {
 	child.tokenEnd = parent.tokenEnd
 	tokenAPI.stackFrame = child
 
-	return tokenAPI.stackLevel
+	return newStackLevel
 }
 
 // Merge appends the results of a forked child API (runes, tokens) to the
@@ -187,6 +186,7 @@ func (tokenAPI *API) Merge(stackLevel int) {
 	}
 
 	parent := &tokenAPI.stackFrames[stackLevel-1]
+	f := tokenAPI.stackFrame
 
 	// The end of the parent slice aligns with the start of the child slice.
 	// Because of this, to merge the parent slice can simply be expanded
@@ -196,37 +196,38 @@ func (tokenAPI *API) Merge(stackLevel int) {
 	// After merge operation:
 	// parent:   |-----------------|
 	// child:                      |---> continue reading from here
-	parent.bytesEnd = tokenAPI.stackFrame.bytesEnd
-	tokenAPI.stackFrame.bytesStart = tokenAPI.stackFrame.bytesEnd
+	parent.bytesEnd = f.bytesEnd
+	f.bytesStart = f.bytesEnd
 
 	// The same logic applies to tokens.
-	parent.tokenEnd = tokenAPI.stackFrame.tokenEnd
-	tokenAPI.stackFrame.tokenStart = tokenAPI.stackFrame.tokenEnd
+	parent.tokenEnd = f.tokenEnd
+	f.tokenStart = f.tokenEnd
 
-	parent.offset = tokenAPI.stackFrame.offset
-	parent.line = tokenAPI.stackFrame.line
-	parent.column = tokenAPI.stackFrame.column
+	parent.offset = f.offset
+	parent.line = f.line
+	parent.column = f.column
 
-	tokenAPI.stackFrame.err = nil
+	f.err = nil
 }
 
 // Reset moves the input cursor back to the beginning for the currently active API child.
 // Aditionally, any output (bytes and tokens) that was emitted from the API child are
 // cleared as well.
 func (api *API) Reset() {
+	f := api.stackFrame
 	if api.stackLevel == 0 {
-		api.stackFrame.column = 0
-		api.stackFrame.line = 0
-		api.stackFrame.offset = 0
+		f.column = 0
+		f.line = 0
+		f.offset = 0
 	} else {
 		parent := api.stackFrames[api.stackLevel-1]
-		api.stackFrame.column = parent.column
-		api.stackFrame.line = parent.line
-		api.stackFrame.offset = parent.offset
+		f.column = parent.column
+		f.line = parent.line
+		f.offset = parent.offset
 	}
-	api.stackFrame.bytesEnd = api.stackFrame.bytesStart
-	api.stackFrame.tokenEnd = api.stackFrame.tokenStart
-	api.stackFrame.err = nil
+	f.bytesEnd = f.bytesStart
+	f.tokenEnd = f.tokenStart
+	f.err = nil
 }
 
 func (tokenAPI *API) Dispose(stackLevel int) {
diff --git a/tokenize/api_bytemode.go b/tokenize/api_bytemode.go
index 8e13b90..7836984 100644
--- a/tokenize/api_bytemode.go
+++ b/tokenize/api_bytemode.go
@@ -40,18 +40,10 @@ func (byteMode ByteMode) SkipMulti(bytes ...byte) {
 }
 
 func (byteMode ByteMode) Accept(b byte) {
-	byteMode.Append(b)
+	byteMode.api.Output.AddByte(b)
 	byteMode.Skip(b)
 }
 
-func (byteMode ByteMode) Append(b byte) {
-	a := byteMode.api
-	f := a.stackFrame
-	a.growOutputData(f.bytesEnd + 1)
-	a.outputData[f.bytesEnd] = b
-	f.bytesEnd++
-}
-
 // AcceptMulti is used to accept one or more bytes that were read from the input.
 // This tells the tokenizer: "I've seen these bytes. I want to make use of them
 // for the final output, so please remember them for me. I will now continue
@@ -64,29 +56,6 @@ func (byteMode ByteMode) Append(b byte) {
 // After the call, byte offset 0 for PeekByte() and PeekRune() will point at
 // the first byte after the accepted bytes.
 func (byteMode ByteMode) AcceptMulti(bytes ...byte) {
-	byteMode.AppendMulti(bytes...)
+	byteMode.api.Output.AddBytes(bytes...)
 	byteMode.SkipMulti(bytes...)
 }
-
-func (byteMode ByteMode) AppendMulti(bytes ...byte) {
-	a := byteMode.api
-	f := a.stackFrame
-	curBytesEnd := f.bytesEnd
-	newBytesEnd := curBytesEnd + len(bytes)
-
-	a.growOutputData(newBytesEnd)
-	copy(a.outputData[curBytesEnd:], bytes)
-	f.bytesEnd = newBytesEnd
-}
-
-func (api *API) dataAddByte(b byte) {
-	curBytesEnd := api.stackFrame.bytesEnd
-	api.growOutputData(curBytesEnd + 1)
-	api.outputData[curBytesEnd] = b
-	api.stackFrame.bytesEnd++
-}
-
-func (api *API) dataSetBytes(bytes ...byte) {
-	api.Output.ClearData()
-	api.Byte.AppendMulti(bytes...)
-}
diff --git a/tokenize/api_output.go b/tokenize/api_output.go
index 1bfd86f..1684bdb 100644
--- a/tokenize/api_output.go
+++ b/tokenize/api_output.go
@@ -33,15 +33,16 @@ func (o Output) ClearData() {
 
 func (o Output) SetBytes(bytes ...byte) {
 	o.ClearData()
-	o.api.dataSetBytes(bytes...)
+	o.AddBytes(bytes...)
 }
 
 func (o Output) AddByte(b byte) {
-	o.api.dataAddByte(b)
-}
-
-func (o Output) AddBytes(bytes ...byte) {
-	o.api.Byte.AppendMulti(bytes...)
+	a := o.api
+	f := a.stackFrame
+	curBytesEnd := f.bytesEnd
+	a.growOutputData(curBytesEnd + 1)
+	a.outputData[curBytesEnd] = b
+	f.bytesEnd++
 }
 
 func (o Output) SetRunes(runes ...rune) {
@@ -49,6 +50,16 @@ func (o Output) SetRunes(runes ...rune) {
 	o.AddRunes(runes...)
 }
 
+func (o Output) AddBytes(bytes ...byte) {
+	a := o.api
+	f := a.stackFrame
+	curBytesEnd := f.bytesEnd
+	newBytesEnd := curBytesEnd + len(bytes)
+	a.growOutputData(newBytesEnd)
+	copy(a.outputData[curBytesEnd:], bytes)
+	f.bytesEnd = newBytesEnd
+}
+
 func (o Output) AddRunes(runes ...rune) {
 	a := o.api
 	f := a.stackFrame
@@ -60,7 +71,7 @@ func (o Output) AddRunes(runes ...rune) {
 }
 
 func (o Output) AddString(s string) {
-	o.api.Byte.AppendMulti([]byte(s)...)
+	o.AddBytes([]byte(s)...)
 }
 
 func (o Output) SetString(s string) {
diff --git a/tokenize/api_runemode.go b/tokenize/api_runemode.go
index 2fcd4be..819e981 100644
--- a/tokenize/api_runemode.go
+++ b/tokenize/api_runemode.go
@@ -37,7 +37,7 @@ func (runeMode RuneMode) Peek(offset int) (rune, int, error) {
 //
 // After the call, byte offset 0 for PeekByte() and PeekRune() will point at
 // the first byte after the skipped rune.
-func (runeMode *RuneMode) Skip(r rune) {
+func (runeMode RuneMode) Skip(r rune) {
 	f := runeMode.api.stackFrame
 	f.moveCursorByRune(r)
 	f.offset += utf8.RuneLen(r)
@@ -53,7 +53,7 @@ func (runeMode *RuneMode) Skip(r rune) {
 //
 // After the call, byte offset 0 for PeekByte() and PeekRune() will point at
 // the first byte after the skipped runes.
-func (runeMode *RuneMode) SkipMulti(runes ...rune) {
+func (runeMode RuneMode) SkipMulti(runes ...rune) {
 	f := runeMode.api.stackFrame
 	for _, r := range runes {
 		f.moveCursorByRune(r)
@@ -72,7 +72,7 @@ func (runeMode *RuneMode) SkipMulti(runes ...rune) {
 //
 // After the call, byte offset 0 for PeekByte() and PeekRune() will point at
 // the first byte after the accepted rune.
-func (runeMode *RuneMode) Accept(r rune) {
+func (runeMode RuneMode) Accept(r rune) {
 	a := runeMode.api
 	f := a.stackFrame
 	curBytesEnd := f.bytesEnd
@@ -97,7 +97,7 @@ func (runeMode *RuneMode) Accept(r rune) {
 //
 // After the call, byte offset 0 for PeekByte() and PeekRune() will point at
 // the first byte after the accepted runes.
-func (runeMode *RuneMode) AcceptMulti(runes ...rune) {
+func (runeMode RuneMode) AcceptMulti(runes ...rune) {
 	a := runeMode.api
 	f := a.stackFrame
 	runesAsString := string(runes)
diff --git a/tokenize/handlers_builtin_test.go b/tokenize/handlers_builtin_test.go
index bcdf512..c190899 100644
--- a/tokenize/handlers_builtin_test.go
+++ b/tokenize/handlers_builtin_test.go
@@ -7,16 +7,6 @@ import (
 	tokenize "git.makaay.nl/mauricem/go-parsekit/tokenize"
 )
 
-// TODO cleanup when I'm finished with these.
-func TestCombinatorsTempDebug(t *testing.T) {
-	var a = tokenize.A
-	AssertHandlers(t, []HandlerT{
-		// {"024", a.IPv4CIDRMask, true, "24"},
-		// {"024", a.Octet, true, "24"},
-		{"192.168.6.123/024", a.IPv4Net, true, "192.168.6.123/24"},
-	})
-}
-
 func TestCombinators(t *testing.T) {
 	var c, a, m = tokenize.C, tokenize.A, tokenize.M
 	AssertHandlers(t, []HandlerT{