The ASCII (a) and Latin (l) character categories are inconsistent in what characters they contain.

It should be clear what the ASCII category means, but it omits 00-1f (contrary to a comment in the code).

The Latin category isn't exactly defined anywhere but should reasonably comprise letters from Latin-based scripts. Currently, it also includes many control characters and symbols from the ASCII and Latin-1 Supplement blocks, which seems hard to justify.

Other changes to Latin could be argued: what modifiers/combining chars should be included? What about IPA and non-IPA phonetics? Ligatures? What about Latin-derived forms such as circled letters? &c. The attached patch does not go there but only fixes the glaring errors in the 00-ff range.