Add value< (bug#69709)

It's a general-purpose polymorphic ordering function, like `<` but
for any two values of the same type.

* src/data.c (syms_of_data): Add the `type-mismatch` error.
* src/fns.c (Fstring_lessp): Extract the bulk of this function to...
(string_cmp): ...this 3-way comparison function, for use elsewhere.
(value_cmp, Fvaluelt): New.
* test/src/fns-tests.el (fns-value<-ordered, fns-value<-unordered)
(fns-value<-type-mismatch, fns-value<-symbol-with-pos)
(fns-value<-circle): New tests.

0 files changed, 0 insertions, 0 deletions