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wren/test/core/string_byte_sequence/count.wren

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// Simple.
IO.print("".bytes.count) // expect: 0
IO.print("123".bytes.count) // expect: 3
// UTF-8.
// Bytes:
// 123456789
// Chars: sø mé ஃ
IO.print("søméஃ".bytes.count) // expect: 9
// Null bytes.
IO.print("\0\0\0".bytes.count) // expect: 3
// Invalid UTF-8.
IO.print("\xef\xf7".bytes.count) // expect: 2