gen.StructStrict, which errors if gens contains keys the target struct does not contain?

[coventry]

I'm thinking of writing a gen.StructStrict, which panics if gens contains keys which are not fields on rt, so for instance the "NotThere" key in struct_test.go::TestStruct would cause a failure. Would you be likely to accept this as a PR?

[untoldwind]

Sure, any PR is welcomed ;)

[jonaslagoni]

Was just about to request this 👍 😄

[coventry]

@jonaslagoni, please try #77.