This refactoring helps us clean up the interpolation code and
guarantee it works as expected since it goes under the same
tokenization rules. It also helps provide better sigil handling
(going to be improved in upcoming commits).
We also rename Binary.Chars to String.Chars.
As Binary.Chars was the protocol used for interpolation,
it is semantically correct to have a protocol that works
on strings, instead of raw binaries.
This means the second item in the AST is no longer an integer
(representing the line), but a keywords list. Code that relies
on the line information from AST or that manually generate AST
nodes need to be properly updated.
José Valim
elegua
mururu
Kim Shrier