Slice does not work with multi-byte characters #3
Description
the slice method is used a lot to remove the first character for example. but the number you pass into slice(1) doesn't say "slice one character" but "slice one byte" there are lots of characters with codepoints ranging over multiple bytes. so maybe do mystring.slice(mystring.codepoints.at(0).len()) which could be expensive over time, but I'm not sure.