"hellohello"
"hello hello"
5
['h', 'e', 'l', 'l', 'o']
['α', 'β']
[]
['α', 'β', 'γ']
"αβγ"
"αβγ"
"αβγ"
{ byteIdx := 2 }
['α', 'β']
"αβa"
"α α-"
'A'
"aβγ"
"abγ"
"abc"
"cbγ"
"0bc"
"01c"
"012"
"21c"
"λbc"
"abc-bc"
"abc"
"a\x00bb"
4
false
true
false
false
true
true
false
true
false
"βγ"
"γ"
"αβγδ".toRawSubstring
"abcd".toRawSubstring
"abcd".toRawSubstring
["abc".toRawSubstring, "αβγ".toRawSubstring, "123".toRawSubstring, "".toRawSubstring]
["abc".toRawSubstring, "αβγ".toRawSubstring, "123".toRawSubstring, "".toRawSubstring]
'α'
'β'
{ byteIdx := 4 }