_matchCase

Tweaks the case of the received Text to match that of the Function this is defined in. -- Function
Text Type -> _matchCase (levels) -> Text Type
Receives -- Text Type
Some text, usually one word
levels (optional)
The number of levels up that this will look for the match
Produces
The received text, capitalized if this Function was capitalized
This is a very specialized function, designed for cases where you want to define a Text or Function that results in some Text, but you want the case of that Text (upper or lower) to match the way the Function was invoked.
So for example, if you have a Function named Sie (one of the common choices for a gender-neutral pronoun), which produces "he" if the received value is male or "she" if it's female, you would use _matchCase so that, when I invoke it as [[James -> sie]] I get "he", but when I invoke it as [[Mary -> Sie]], I get "She".
Occasionally, you want to use this in a Function that is intended for use inside other Functions. You can use the levels parameter to specify how far up to look. By default it is 1 (this Function); if you set it to 2 it will be the Function that called this one, and so on.
This will probably get moved to a text-manipulation Mixin at some time down the road.