Where to validate a condition's subtypes?

[sbellem]

Some questions:

• Should the implementation silently ignore extra unsupported subtypes?

If not, then when should the implementation complain about it?

• At parsing time?
• When .validate() is explicitly called?

As an example, if we were to validate the subtypes when parsing, we could do so:

class ConditionTypes(BitString):
    namedValues = NamedValues(
        ('preImageSha256', 0),
        ('prefixSha256', 1),
        ('thresholdSha256', 2),
        ('rsaSha256', 3),
        ('ed25519Sha256', 4),
    )
    subtypeSpec = ValueSizeConstraint(0, 5)

The line subtypeSpec = ValueSizeConstraint(0, 5) requires the length of the BIT STRING to be no longer than 5.