Read-only string of bytes. Use Str.size to get the size in bytes
of the string (without NUL terminator). All KC3 strings are bound-
checked according to their size and are NUL terminated.
A string litteral starts and ends with double quotes "
or triple quotes """ and inside of a string litteral you can use
the #{expr} syntax to evaluate expr to a Str inside of the
litteral. The string litteral is then parsed as a Call to KC3.str
and not an actual Str. At evaluation the arguments to the call
and KC3.str gets called concatenating at once all the parts to a
brand new Str.
ikc3> "123"
"123"
ikc3> type("123")
Str
ikc3> b = 2
2
ikc3> "1#{b}3"
"123"
ikc3> type("1#{b}3")
Str
ikc3> quote "1#{b}3"
"1#{b}3"
ikc3> type(quote "1#{b}3")
Call
ikc3> type(quote quote "1#{b}3")
Quote