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
0.095dev (GIT hash fe578dbae82d257bfb6d755e3b05abbf37247dbe)