well boys*, it looks like tail calls are back on the menu https://hg.mozilla.org/mozilla-central/file/3e4e0fef13e01bf3376f61590d5d5744d4b0b22f/modules/libpref/init/StaticPrefList.yaml#l7583
(a sequence of zero or more boys)
@wingo
So...the 60s want their optimizations back?
