2019-09: extractVocabularies trusts all $vocabulary values are booleans

[aeschli]

Found while reviewing #308 (JSON Schema 2019-09 support).

Problem

extractVocabularies in src/services/jsonSchemaService.ts stores $vocabulary values verbatim:

for (const [uri, required] of Object.entries(metaschema.$vocabulary)) {
    vocabs.set(uri, required);
}

A malformed meta-schema with non-boolean values would flow into isFormatAssertionEnabled (which does return format201909), potentially returning a non-boolean.

Suggested direction

Normalize values with === true (or validate/skip non-boolean entries).

Severity

Low — robustness/edge case.