🚀 go-pugleaf

Here is a quick suggestion for case-fold-search values for GNU emacs
and any other editors that don't have their equivalents already:

	nil	searches don't fold
	'up	searches fold up but not down
	'down	searches fold down but not up
	t	searches fold both directions

With 'up, for example, /aBc/ matches /aBc/ and /ABc/, but not /AbC/.

Another suggestion is to allow quoting in a string or a regexp to have
a character not be folded.

e.g.  /\Abc/ when c-f-s is t matches /Abc/ but not /abc/.

(In GNU emacs 18.55, it's this:)

	case-fold-search's value is t

	Documentation:
	*Non-nil if searches should ignore case.
	Automatically becomes local when set in any fashion.

These changes would be nice in grep(1) and elsewhere also.  pc-write
is the only program that I know of that can do 'up.

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