only once (float obviously doesn't set any context at all).

plain tuples to immutable iterable objects with named attributes
(structseq objects).

measure.

that was last accessed. In the pi benchmark (64-bit platform, prec=9),
_decimal is now only 1.5x slower than float.

"Refactor" docs for the new dir_fd, follow_symlinks, path-as-fd APIs: document the options at a central place and link to it.