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
mururu
Kim Shrier