FEATURE: Object Entry and Containment Builtins

Field	Value
Version	20260822 V1
Description	Provide jq object-key, entry-conversion, and containment builtins.
Depends On	ARCHITECTURE.md, FEATURE-DATA-002.md
Provides	keys, keys_unsorted, has, in, inside, contains, to_entries, from_entries, with_entries
Consumes	jq value model, comparison and ordering

Workflow

Implement key enumeration for arrays and objects, membership predicates, recursive containment and inverse containment, object-to-entry and entry-to-object conversion, and with_entries transformations. Preserve jq's key ordering and handling of supported key aliases.

Programmatic Acceptance

=== AC data-003-conformance ===
Intent: The object-entry, key, membership, and containment slice executes matching corpus cases and passes all selected cases.
Suite: scoped
Requires: executable=python3; scope=test

import json import os import subprocess import sys

select = r"keys|has\(|contains|inside|to_entries|from_entries" result = subprocess.run( [sys.executable, "sources/run_conformance.py", "--select", select, "--json"], capture_output=True, text=True, env={**os.environ, "JQ": f"{os.getcwd()}/jq"}, ) print(result.stdout) print(result.stderr, file=sys.stderr) report = json.loads(result.stdout) summary = report["summary"] assert sum(summary.values()) > 0 assert summary["fail"] == 0 assert summary["error"] == 0 assert result.returncode == 0 === END AC data-003-conformance ===

User Acceptance

None.

Guardrails

keys must use Unicode codepoint ordering; keys_unsorted must preserve insertion-oriented ordering.
Containment must recurse structurally and must not confuse booleans with numbers.