count_code_units:
13

count_code_points:
6

code_point_offset:
string.code_point_offset(Str, 0, 0)
string.code_point_offset(Str, 0, 1, 1)
string.index(Str, 0, 'a')
string.code_point_offset(Str, 1, 1)
string.code_point_offset(Str, 1, 1, 3)
string.index(Str, 1, 'ß')
string.code_point_offset(Str, 2, 3)
string.code_point_offset(Str, 3, 1, 5)
string.index(Str, 3, 'ξ')
string.code_point_offset(Str, 3, 5)
string.code_point_offset(Str, 5, 1, 8)
string.index(Str, 5, '啕')
string.code_point_offset(Str, 4, 8)
string.code_point_offset(Str, 8, 1, 12)
string.index(Str, 8, '𐀀')
string.code_point_offset(Str, 5, 12)
string.code_point_offset(Str, 12, 1, _) failed
string.index(Str, 12, '.')
string.code_point_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, 195, 159, 206, 190, 229, 149, 149, 240, 144, 128, 128, 46]

from_code_unit_list:
aßξ啕𐀀.

index_next:
index_next(Str, 0, 1, 'a')
index_next(Str, 1, 3, 'ß')
index_next(Str, 3, 5, 'ξ')
index_next(Str, 5, 8, '啕')
index_next(Str, 8, 12, '𐀀')
index_next(Str, 12, 13, '.')
end

index_next(-1):
end

unsafe_index_next:
unsafe_index_next(Str, 0, 1, 'a')
unsafe_index_next(Str, 1, 3, 'ß')
unsafe_index_next(Str, 3, 5, 'ξ')
unsafe_index_next(Str, 5, 8, '啕')
unsafe_index_next(Str, 8, 12, '𐀀')
unsafe_index_next(Str, 12, 13, '.')
end

unsafe_prev_index:
unsafe_prev_index(Str, 13, 12, '.')
unsafe_prev_index(Str, 12, 8, '𐀀')
unsafe_prev_index(Str, 8, 5, '啕')
unsafe_prev_index(Str, 5, 3, 'ξ')
unsafe_prev_index(Str, 3, 1, 'ß')
unsafe_prev_index(Str, 1, 0, 'a')
end

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

left_by_code_point:
aßξ

right_by_code_point:
啕𐀀.

between_code_points:
between_code_points(Str, -2, -2, "")
between_code_points(Str, -2, -1, "")
between_code_points(Str, -2, 0, "")
between_code_points(Str, -2, 1, "a")
between_code_points(Str, -2, 2, "aß")
between_code_points(Str, -2, 3, "aßξ")
between_code_points(Str, -2, 4, "aßξ啕")
between_code_points(Str, -2, 5, "aßξ啕𐀀")
between_code_points(Str, -2, 6, "aßξ啕𐀀.")
between_code_points(Str, -2, 7, "aßξ啕𐀀.")
between_code_points(Str, -1, -2, "")
between_code_points(Str, -1, -1, "")
between_code_points(Str, -1, 0, "")
between_code_points(Str, -1, 1, "a")
between_code_points(Str, -1, 2, "aß")
between_code_points(Str, -1, 3, "aßξ")
between_code_points(Str, -1, 4, "aßξ啕")
between_code_points(Str, -1, 5, "aßξ啕𐀀")
between_code_points(Str, -1, 6, "aßξ啕𐀀.")
between_code_points(Str, -1, 7, "aßξ啕𐀀.")
between_code_points(Str, 0, -2, "")
between_code_points(Str, 0, -1, "")
between_code_points(Str, 0, 0, "")
between_code_points(Str, 0, 1, "a")
between_code_points(Str, 0, 2, "aß")
between_code_points(Str, 0, 3, "aßξ")
between_code_points(Str, 0, 4, "aßξ啕")
between_code_points(Str, 0, 5, "aßξ啕𐀀")
between_code_points(Str, 0, 6, "aßξ啕𐀀.")
between_code_points(Str, 0, 7, "aßξ啕𐀀.")
between_code_points(Str, 1, -2, "")
between_code_points(Str, 1, -1, "")
between_code_points(Str, 1, 0, "")
between_code_points(Str, 1, 1, "")
between_code_points(Str, 1, 2, "ß")
between_code_points(Str, 1, 3, "ßξ")
between_code_points(Str, 1, 4, "ßξ啕")
between_code_points(Str, 1, 5, "ßξ啕𐀀")
between_code_points(Str, 1, 6, "ßξ啕𐀀.")
between_code_points(Str, 1, 7, "ßξ啕𐀀.")
between_code_points(Str, 2, -2, "")
between_code_points(Str, 2, -1, "")
between_code_points(Str, 2, 0, "")
between_code_points(Str, 2, 1, "")
between_code_points(Str, 2, 2, "")
between_code_points(Str, 2, 3, "ξ")
between_code_points(Str, 2, 4, "ξ啕")
between_code_points(Str, 2, 5, "ξ啕𐀀")
between_code_points(Str, 2, 6, "ξ啕𐀀.")
between_code_points(Str, 2, 7, "ξ啕𐀀.")
between_code_points(Str, 3, -2, "")
between_code_points(Str, 3, -1, "")
between_code_points(Str, 3, 0, "")
between_code_points(Str, 3, 1, "")
between_code_points(Str, 3, 2, "")
between_code_points(Str, 3, 3, "")
between_code_points(Str, 3, 4, "啕")
between_code_points(Str, 3, 5, "啕𐀀")
between_code_points(Str, 3, 6, "啕𐀀.")
between_code_points(Str, 3, 7, "啕𐀀.")
between_code_points(Str, 4, -2, "")
between_code_points(Str, 4, -1, "")
between_code_points(Str, 4, 0, "")
between_code_points(Str, 4, 1, "")
between_code_points(Str, 4, 2, "")
between_code_points(Str, 4, 3, "")
between_code_points(Str, 4, 4, "")
between_code_points(Str, 4, 5, "𐀀")
between_code_points(Str, 4, 6, "𐀀.")
between_code_points(Str, 4, 7, "𐀀.")
between_code_points(Str, 5, -2, "")
between_code_points(Str, 5, -1, "")
between_code_points(Str, 5, 0, "")
between_code_points(Str, 5, 1, "")
between_code_points(Str, 5, 2, "")
between_code_points(Str, 5, 3, "")
between_code_points(Str, 5, 4, "")
between_code_points(Str, 5, 5, "")
between_code_points(Str, 5, 6, ".")
between_code_points(Str, 5, 7, ".")
between_code_points(Str, 6, -2, "")
between_code_points(Str, 6, -1, "")
between_code_points(Str, 6, 0, "")
between_code_points(Str, 6, 1, "")
between_code_points(Str, 6, 2, "")
between_code_points(Str, 6, 3, "")
between_code_points(Str, 6, 4, "")
between_code_points(Str, 6, 5, "")
between_code_points(Str, 6, 6, "")
between_code_points(Str, 6, 7, "")
between_code_points(Str, 7, -2, "")
between_code_points(Str, 7, -1, "")
between_code_points(Str, 7, 0, "")
between_code_points(Str, 7, 1, "")
between_code_points(Str, 7, 2, "")
between_code_points(Str, 7, 3, "")
between_code_points(Str, 7, 4, "")
between_code_points(Str, 7, 5, "")
between_code_points(Str, 7, 6, "")
between_code_points(Str, 7, 7, "")