[text-format] Fix parsing of string literals #730
+66
−22
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This renames
next_byte_value
tonext_str_lit_bytes
and changes the signature so that it returns between 1..=4 bytes per call, representing the variable-length nature of the UTF-8 encoding.note: I'm not sure how best to add tests for this, and it needs it; in particular there should be a test case of a text-format input that contains a non-ascii string literal. There should probably also be more tests for the weird byte escapes? But definitely a case with non-ascii text.