IsValid fns should return bool strictly

[dapplion]

• Clean up after Use assert instead of return bool #18

Just return bool to conform with the API defined in the spec

[asn-d6]

Not a big fan of this huge indented try blocks. Can you split the func into func() and func_impl() and have func_impl() do all the stuff, and then have func() call func_impl() and do the try return value logic? Maybe that would look better?

[dapplion]

Not a big fan of this huge indented try blocks. Can you split the func into func() and func_impl() and have func_impl() do all the stuff, and then have func() call func_impl() and do the try return value logic? Maybe that would look better?

IsValid* fns wrap AssertIsValid* which contain the not indented implementation

addressed