Strict mode #2
Description
Strict mode might add two things:
- Require the user to specify if they want to opt-in to the array behavior (probably be able to mask "either a scalar or an array", "only accept arrays", "only accept scalars" -- we always allow both at the moment).
- Error on missing keys
Not sure if it should be 2 different flags, or a single one, or just become the default.