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