Rich_text: do not silently truncate buffers, but export function [truncate].
Log: uses [Rich_text.truncate] on messages printed on terminal, and prefix
     truncated messages to indicate the truncation.

The new parameter is -eva-cache-size.

Also take a Hptmap_sig.cache_type argument instead of ~name and ~temporary.
This is consistent with all other cached functions in hptmap.

Credit to Thibault Martin

Credit to Thibault Martin

- Better names in composition.mli
- Adding @since everywhere
- Some spaces to pin doc onto the module instead of its content

Credit to Virgile Prevosto

Based on distributives laws

Credit to Virgile Prevosto

Credit to Basile Desloges

Guillaume Combette authored 5 months ago and David Bühler committed 5 months ago

The performance impact is small but measurable (about 2% in run time
difference for polarssl and debie1 in open-source-case-studies). That's
the tradeoff for not having to worry about misusing Obj.