invalid_second_byte_e0_80: [2, fffd, fffd]
invalid_second_byte_f4_90: [2, fffd, fffd]
split_valid_2_byte: [1, e9]
split_valid_3_byte: [1, 800]
split_valid_4_byte: [2, 10000]
eof_incomplete_2_byte: [1, fffd]
eof_incomplete_3_byte: [1, fffd]
eof_incomplete_4_byte: [1, fffd]
ascii_prefix_then_eof_incomplete_3_byte: [1, 78] | [1, fffd]
incomplete_prefix_then_ascii: [2, fffd, 78]
complete_sequence_with_extra_continuation: [2, e9, fffd]
surrogate_sequence: [3, fffd, fffd, fffd]
invalid_lead_f5_with_continuations: [4, fffd, fffd, fffd, fffd]
overlong_c0_with_continuations: [3, fffd, fffd, fffd]
continuation_only_tail: [4, fffd, fffd, fffd, fffd]
invalid_lead_then_ascii: [2, fffd, 78]
invalid_lead_with_continuations_then_ascii: [5, fffd, fffd, fffd, fffd, 78]