Formatting function for scalar values.
This is used in the default ‘__repr__’. The returned formatting
function receives instances of your scalar type.
An indicated for whether or not your array is being printed
within a Series, DataFrame, or Index (True), or just by
itself (False). This may be useful if you want scalar values
to appear differently within a Series versus on its own (e.g.
quoted or not).
A callable that gets instances of the scalar type and
returns a string. By default, repr() is used
when boxed=False and str() is used when