The unquote function is not consistent with Ruby Sass

[T-Hugs]

Title: unquote(""hello" and "goodbye"") incorrectly strips the first and last quotes.

input.scss

@debug unquote("\"hello\" and \"goodbye\"");

libsass

DEBUG: hello" and "goodbye

ruby sass 3.4.19

DEBUG: "hello" and "goodbye"

version info:

$ sassc.exe --version
sassc: [NA] (master: 077af530)
libsass: [NA] (master: 014a61b6)
sass2scss: 1.0.6
sass: 3.4

[mgreter]

Seems to be a duplicate of #2153