chore: make deps

vendor/github.com/clipperhouse/stringish/.gitignore

@@ -0,0 +1,2 @@
+.DS_Store
+*.test

vendor/github.com/clipperhouse/stringish/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Matt Sherman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/clipperhouse/stringish/README.md

@@ -0,0 +1,64 @@
+# stringish
+
+A small Go module that provides a generic type constraint for “string-like”
+data, and a utf8 package that works with both strings and byte slices
+without conversions.
+
+```go
+type Interface interface {
+	~[]byte | ~string
+}
+```
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/clipperhouse/stringish/utf8.svg)](https://pkg.go.dev/github.com/clipperhouse/stringish/utf8)
+[![Test Status](https://github.com/clipperhouse/stringish/actions/workflows/gotest.yml/badge.svg)](https://github.com/clipperhouse/stringish/actions/workflows/gotest.yml)
+
+## Install
+
+```
+go get github.com/clipperhouse/stringish
+```
+
+## Examples
+
+```go
+import (
+    "github.com/clipperhouse/stringish"
+    "github.com/clipperhouse/stringish/utf8"
+)
+
+s := "Hello, 世界"
+r, size := utf8.DecodeRune(s)   // not DecodeRuneInString 🎉
+
+b := []byte("Hello, 世界")
+r, size = utf8.DecodeRune(b)    // same API!
+
+func MyFoo[T stringish.Interface](s T) T {
+    // pass a string or a []byte
+    // iterate, slice, transform, whatever
+}
+```
+
+## Motivation
+
+Sometimes we want APIs to accept `string` or `[]byte` without having to convert
+between those types. That conversion usually allocates!
+
+By implementing with `stringish.Interface`, we can have a single API, and
+single implementation for both types: one `Foo` instead of `Foo` and
+`FooString`.
+
+We have converted the
+[`unicode/utf8` package](https://github.com/clipperhouse/stringish/blob/main/utf8/utf8.go)
+as an example -- note the absence of`*InString` funcs. We might look at `x/text`
+next.
+
+## Used by
+
+- clipperhouse/uax29: [stringish trie](https://github.com/clipperhouse/uax29/blob/master/graphemes/trie.go#L27), [stringish iterator](https://github.com/clipperhouse/uax29/blob/master/internal/iterators/iterator.go#L9), [stringish SplitFunc](https://github.com/clipperhouse/uax29/blob/master/graphemes/splitfunc.go#L21)
+
+- [clipperhouse/displaywidth](https://github.com/clipperhouse/displaywidth)
+
+## Prior discussion
+
+- [Consideration of similar by the Go team](https://github.com/golang/go/issues/48643)

vendor/github.com/clipperhouse/stringish/interface.go

@@ -0,0 +1,5 @@
+package stringish
+
+type Interface interface {
+	~[]byte | ~string
+}