substring_codepoint
String.substring_codepoint
create substring of this string consisting of codepoints from (inclusive) .. to (exclusive).
Precondition
pre debug : 0 ≤ from ≤ to (debug 2): to ≤ codepoint_count
0.099dev (GIT hash d73ed58c41900ddb0f9db04a3da9b8f72f3699ad)