simple-salesforce-mdapi-methods-return-tuples-not-dicts
SfdcMetadataApi methods return tuples, not dicts — deploy() returns a 4-tuple (deployment_id, state, …), check_retrieve_status() returns a 3-tuple. Never call .get() on these return values; destructure the tuple explicitly. Calling .get() on the tuple raises AttributeError silently masked by quality_gate.curate().