schemars deprecated schemas

[jeroenvervaeke]

schemars deprecated a lot of types for 1.0.0

Changelog:
https://github.com/GREsau/schemars/blob/master/CHANGELOG.md#removed-%EF%B8%8F-breaking-changes-%EF%B8%8F-1

Removed types:

• RootSchema
• SchemaObject
• Metadata
• SubschemaValidation
• NumberValidation
• StringValidation
• ArrayValidation
• ObjectValidation
• InstanceType
• SingleOrVec

I'm thinking about adding the types to this crate and remove the dependency on schemars.

Would this change be welcome?
If so I'll implement it.

[ahl]

Agreed that we'll need a solution if we migrate off of schemars. In exploring this, I've observed that there's significant opportunity to improve upon the types from schemars. I've been exploring generating the types using the schema files for various JSON Schema drafts in a sort of bootstrapping mode for typify. This work is wrapped up with a prototype for multi-file support, improved errors, etc.

While the offer is appreciated, I'll decline for now. And even when schemars 1.0 does come out, I think that typify can safely stay with 0.8. Thank you!