### Strings
[ Type strings Funcon string Funcon string-append Funcon to-string ] Type strings ~> lists(characters)
Funcon string(C*:characters*) : =>strings
~> [C*]
*/
Funcon string-append(S*:strings*) : =>strings
~> list-append(S*)
Built-in Funcon to-string(_:ground-values) : =>strings
/*
The strings returned by `to-string(GV)` are unspecified, except that when
`GV` is already a string, it is returned unchanged.
*/
/*
Literal strings are written `"C1...Cn"`. A double-quote or backslash needs to be escaped: `"...\"..."`, `"...\\..."`.