Support property attributes: nonnull and nullable

[Ashton-W]

Should Mantle support validation based on the new property attributes nonnull and nullable
Read about them here

@property (copy, nullable) NSString *name;
@property (copy, readonly, nonnull) NSArray *allItems;

Assuming they are available in the runtime, should Mantle use them to inform the validation of models? The checks these attributes add are at compile time, so have no effect on Mantle's KVC powered features.

[jspahrsummers]

I'm pretty sure these are not available at runtime. Even if they were, Mantle doesn't perform much automatic validation—most of that is up to your model.

[Ashton-W]

That is true, it is up to you to add Key-Value Validation methods to your model. This doesn't exactly fall under the JSON checks.
Maybe this could be changed to an enhancement for validation helper methods in Mantle. Which if possible, would include checking nullability.

Currently, writing the Key-Value Validation methods is a drag.

[github-actions]

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