Xattrs map[string]string

	// PAXRecords is a map of PAX extended header records.
	//
	// User-defined records should have keys of the following form:
	//	VENDOR.keyword
	// Where VENDOR is some namespace in all uppercase, and keyword may
	// not contain the '=' character (e.g., "GOLANG.pkg.version").
	// The key and value should be non-empty UTF-8 strings.
	//
	// When Writer.WriteHeader is called, PAX records derived from the

pkg unicode, const MaxLatin1 ideal-char
pkg unicode, const MaxRune ideal-char
pkg unicode, const ReplacementChar ideal-char
pkg unicode, const TitleCase ideal-int
pkg unicode, const UpperCase ideal-int
pkg unicode, const UpperLower ideal-char
pkg unicode, const Version ideal-string
pkg unicode, func Is(*RangeTable, int32) bool
pkg unicode, func IsControl(int32) bool

those are treated as two code points.  For simplicity, this document
will use the unqualified term <i>character</i> to refer to a Unicode code point
in the source text.
</p>
<p>
Each code point is distinct; for instance, uppercase and lowercase letters
are different characters.
</p>
<p>
Implementation restriction: For compatibility with other tools, a
compiler may disallow the NUL character (U+0000) in the source text.
</p>
<p>

pkg unicode, const MaxCase = 3
pkg unicode, const MaxLatin1 = 255
pkg unicode, const MaxRune = 1114111
pkg unicode, const ReplacementChar = 65533
pkg unicode, const TitleCase = 2
pkg unicode, const UpperCase = 0
pkg unicode, const UpperLower = 1114112
pkg unicode, const Version = "6.2.0"
pkg unicode, type RangeTable struct, LatinOffset int
pkg unicode, var Chakma *RangeTable