Which oneOf / anyOf branch a JSON value matches, or why several or none do

Overview

Evaluates a JSON value against every branch of a oneOf or anyOf in a caller-supplied JSON Schema 2020-12 (or OpenAPI schema converted to it) and reports which branches match, the exact errors of each branch that fails with the JSON pointer of each offending value, the closest branch, and which branch an OpenAPI `discriminator` points to. For agents debugging why a tool or API payload is rejected with 'matches more than one' or 'matches none'. Local $ref only; patterns that ri

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