The metaschemas are useful but not strict enough. They don't set `additionalProperties: false`, which is great if you wanna extend the schema with your own properties, but it won't catch simple typos.
For example, the following issues pass under the metaschema.
This is intentional because unknown keywords are permitted with JSON Schema 2020-12 and prior. We are changing this with the upcoming version, which means we'll be updating the meta-schema to enforce it as well.
For example, the following issues pass under the metaschema.