Just ordered a _compatible_ set of APL keycaps and a Keychron K10 Pro mechanical keyboard. As if I'm not batty enough. #IHaveBrainProblems

This is what I'm up against:

'LE CHAT'[7 5 2 3 4 6 7]

evaluates to

'THE CAT'

',' is a perfectly usable monadic (unary) operator. It's apparently called a 'ravel' and is used to convince the language that something should be treated as a one element list instead of as a scalar.