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=item * Scalars that look like unsigned integers are encoded as such.
UTF-8 strings and strings that fit 7-bit ASCII (including floats and
negatives) are encoded as text. Any other scalar is encoded as binary.

Note that there is no “right way” to determine whether an arbitrary
Perl (non-reference) scalar should be encoded as a string or as a number.
The above seems a reasonable enough approach.

=item * UTF8-flagged strings are encoded as text; others are encoded as
binary. This is a “best-guess” merely; Perl’s UTF8 flag doesn’t reliably
indicate whether a given string is a text or a byte string.

=item * undef, Types::Serialiser::true(), and Types::Serialiser::false()
are encoded as null, true, and false, respectively.

=item * There is no support for streamed (i.e., indefinite-length)
objects.

=item * There is no Perl value that maps to CBOR’s undefined value.