CSS lexing: Spaces are optional after colon for values
Haml: Lex attributes properly after '#id' tags
jit.off() any possible callback-inducing FFI modules

Since I've encountered the "bad callback" LuaJIT panic. I'm guessing
the Scintilla wrapper actually causes this, but there's no way of
knowing for sure. Regardless, any modules that could cause a
C callback back into Lua needs this.
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