Function escape_string 

pub fn escape_string(text: &str) -> String

Escape a string for a Lua double-quoted literal.

Not crate::writer::escape_string, and the difference is a defect that form would produce here. A Lua decimal escape reads up to three digits (Lua 5.4 reference §3.1), so \0 followed by the character 1 is \01, which is the octet 1 and not two octets. Every escape written here is therefore three digits wide, and the ambiguity cannot arise.

Everything outside the control range goes through unchanged, the non-ASCII included: a Lua string is a sequence of octets with no encoding of its own, so the UTF-8 of a wstring holder is written as itself.