Why are there no prepended "is-" for functions that return a boolean?

[morningrat2]

For example, empty [] looks like you're emptying it instead of checking if it's empty.
Why not is-empty []?

[anko]

I agree. Of functions that return a boolean…

• confusing for similar reasons: even, odd, Obj.empty and Str.empty
• trivially OK: is-type and is-it-NaN
• understandable without an "is"-prefix: and-list, or-list, any and all.

In next major version, I suggest we prefix those in the first category and keep the rest as they are.