sequences: add a copy-unsafe that can be used sometimes.
sequences.extras: adding sift! and harvest!.
io.directories: fix docs for (directory-entries).
trees.splay: use typed.
heaps: performance improvements.
tools.completion: small performance improvements.
core-foundation.file-descriptors: inline enable-all-callbacks.
core-foundation.run-loop: CFTimeInterval is a double.
benchmark.linked-assocs: adding a linked-assocs benchmark.
linked-assocs: some performance improvements.
interval-maps: bit of unsafe.
Use -unsafe words with pair methods.
sets: adding clear-set.
hashtables: slightly faster grow logic.
compiler.cfg.alias-analysis: use clear-set.
hash-sets: faster implementation based on hashtables.
hashtables: reuse (rehash).
hash-sets: reuse (rehash).
bootstrap: make sure to rehash hash-sets also.
hash-sets: fix help-lint warnings.