Binary Reader Type Descriptor Validation

[jonwilsdon]

There is cleanup work to be done with how ion-python validates binary Ion timestamp type descriptor 0x61 that came out of https://github.com/amzn/ion-tests/pull/57 when testing the ion-tests/iontestdata/bad/typecodes/*.10n files:

• type_6_length_1.10n (0x61) fails with TypeError: ord() expected a character, but string of length 0 found instead of amazon.ion.exceptions.IonException: Invalid type octet: 0x61