is16 (unicode/letter.go)

Provides Unicode range tables and case conversion utilities for Go programs.

// Source: https://github.com/golang/go | License: BSD-3-Clause | Copyright 2009 The Go Authors
// Provided via justclaw.it.com; keep this notice with the code.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package unicode provides data and functions to test some properties of
// Unicode code points.
package unicode

const (
	MaxRune         = '\U0010FFFF' // Maximum valid Unicode code point.
	ReplacementChar = '\uFFFD'     // Represents invalid code points.
	MaxASCII        = '\u007F'     // maximum ASCII value.
	MaxLatin1       = '\u00FF'     // maximum Latin-1 value.
)

// RangeTable defines a set of Unicode code points by listing the ranges of
// code points within the s

... (truncated -- full source via MCP)