Unicode.Property.other_default_ignorable_code_point
You're seeing just the function
other_default_ignorable_code_point, go back to Unicode.Property module for more information.
Returns :other_default_ignorable_code_point or nil indicating
if the codepoint or string has the property
:other_default_ignorable_code_point.
For string parameters, all codepoints in
the string must have the :other_default_ignorable_code_point
property in order for the result to :other_default_ignorable_code_point.