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The performance impact is way to important, as it requires to
fetch all schema files.
For history, one use case was: 10 seconds to validate, 50ms to request.

Software releases should instead use the slapconfiguration:jsonschema
recipe to reject wrong input.
The recipe must use the schema informations stored on the installation directory.
nexedi/slapos!1638

Move automated schema validation to the cli/request.py client.
Inform when the client start the parameter validation, to spot slowness.