count_code_units:
7

count_codepoints:
6

codepoint_offset:
string.codepoint_offset(Str, 0, 0)
string.codepoint_offset(Str, 0, 1, 1)
string.index(Str, 0, 'a')
string.codepoint_offset(Str, 1, 1)
string.codepoint_offset(Str, 1, 1, 2)
string.index(Str, 1, 'ß')
string.codepoint_offset(Str, 2, 2)
string.codepoint_offset(Str, 2, 1, 3)
string.index(Str, 2, 'ξ')
string.codepoint_offset(Str, 3, 3)
string.codepoint_offset(Str, 3, 1, 4)
string.index(Str, 3, '啕')
string.codepoint_offset(Str, 4, 4)
string.codepoint_offset(Str, 4, 1, 6)
string.index(Str, 4, '𐀀')
string.codepoint_offset(Str, 5, 6)
string.codepoint_offset(Str, 6, 1, _) failed
string.index(Str, 6, '.')
string.codepoint_offset(Str, 6, _) failed

to_char_list:
['a', 'ß', 'ξ', '啕', '𐀀', '.']

from_char_list:
aßξ啕𐀀.

from_rev_char_list:
.𐀀啕ξßa

to_code_unit_list:
[97, 223, 958, 21845, 55296, 56320, 46]

from_code_unit_list:
aßξ啕𐀀.

index_next:
index_next(Str, 0, 1, 'a')
index_next(Str, 1, 2, 'ß')
index_next(Str, 2, 3, 'ξ')
index_next(Str, 3, 4, '啕')
index_next(Str, 4, 6, '𐀀')
index_next(Str, 6, 7, '.')
end

index_next(-1):
end

unsafe_index_next:
unsafe_index_next(Str, 0, 1, 'a')
unsafe_index_next(Str, 1, 2, 'ß')
unsafe_index_next(Str, 2, 3, 'ξ')
unsafe_index_next(Str, 3, 4, '啕')
unsafe_index_next(Str, 4, 6, '𐀀')
unsafe_index_next(Str, 6, 7, '.')
end

unsafe_prev_index:
unsafe_prev_index(Str, 7, 6, '.')
unsafe_prev_index(Str, 6, 4, '𐀀')
unsafe_prev_index(Str, 4, 3, '啕')
unsafe_prev_index(Str, 3, 2, 'ξ')
unsafe_prev_index(Str, 2, 1, 'ß')
unsafe_prev_index(Str, 1, 0, 'a')
end

split_by_codepoint:
split_by_codepoint(Str, -1, "", "aßξ啕𐀀.")
split_by_codepoint(Str, 0, "", "aßξ啕𐀀.")
split_by_codepoint(Str, 1, "a", "ßξ啕𐀀.")
split_by_codepoint(Str, 2, "aß", "ξ啕𐀀.")
split_by_codepoint(Str, 3, "aßξ", "啕𐀀.")
split_by_codepoint(Str, 4, "aßξ啕", "𐀀.")
split_by_codepoint(Str, 5, "aßξ啕𐀀", ".")
split_by_codepoint(Str, 6, "aßξ啕𐀀.", "")

left_by_codepoint:
aßξ

right_by_codepoint:
啕𐀀.

between_codepoints:
ξ啕