@Kaldo Thanks for the suggestion, but unfortunately it doesn't work if the input contains duplicated values (i.e. [1,2,2,3] and [1,1,2,2,3,3,4,4]Try it online.)
I'm not sure if there is enough animo for it from you guys, but perhaps have a 1-byte builtin in v2 for "Not all equal" in a list (currently it's 2 bytes with Ë_)? Unless we don't have many 1-byte no-ops left, in that case nvm.
