Unrecognised keys should throw errors/warnings

[samvanstroud]

Currently, if a user adds an incorrect key, it is ignored. This can be confusing if a user misspells a valid key, or perhaps imagines a field is supported when it isn't.

If a user provides an invalid key, a warning or error should be raised

[sinaatalay]

This feature has been added in v1.12. Previously, the use of arbitrary keys resulted in errors. It allows users to use their own keys in their custom templates, as described here. However, I am open to discussing whether this feature is a good idea or not.

[samvanstroud]

I would consider adding a allow_custom_keys option to configure this behaviour, it might save some confusion :)

[sinaatalay]

That sounds like a good idea. Maybe we need rendercv_settings in addition to cv, design, and locale_catalog. I will keep this issue open until we decide on an approach. Perhaps someone else could offer a new perspective as well.