# Evidence: Block 16 · Service (block-16)

- block type: block
- date: 2026-08-22
- resulting state: closed/verified
- story points (combined assembled cost): 51353
- execution id: 20260823.024538.026Z-0ab32bd1

## Stories built
- Implement type, length, numeric predicates, conversions, and math. (VALUE-004) [story]

## Acceptance tooling authorization
- FEATURE-VALUE-004.md#value-004-conformance: executable=python3; scope=test; authorization=existing Target environment

## Stacked context
- compass: COMPASS.md (SP 3420)
- implements: FEATURE-VALUE-004.md (SP 451)
- context: jq-manual.txt (SP 32696)
- context: jq.test (SP 13058)
- context: ARCHITECTURE_compact.md (SP 154)
- stack: python_compact.md (SP 1534)

## Build directory changes
- jq_interpreter/evaluator.py
- jq_interpreter/parser.py
- tests/test_value_004.py

## Pre-build acceptance observation
- RED: value-004-conformance (FEATURE-VALUE-004.md)
  intent: The implementation passes the authoritative corpus slice covering type, length, numeric predicates, conversions, and math functions.
  return code: 1
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 17,
        "fail": 1,
        "error": 0,
        "skip": 2
      },
      "cases": [
        {
          "line": 741,
          "program": "utf8bytelength",
          "status": "fail",
          "detail": "program did not compile: jq: compile error: unknown filter",
          "expect_failure": false,
          "expected": [
            "6"
          ],
          "actual": []
        },
        {
          "line": 1973,
          "program": "modulemeta | .deps | length",
          "status": "skip",
          "detail": "declared in exclusions.txt",
          "expect_failure": false,
          "expected": [
            "6"
          ],
          "actual": []
        },
        {
          "line": 1977,
          "program": "modulemeta | .defs | length",
          "status": "skip",
          "detail": "declared in exclusions.txt",
          "expect_failure": false,
          "expected": [
            "2"
          ],
          "actual": []
        }
      ]
    }
  stderr:
    --- drydock: progress ---
    cases: pass=17 fail=1 error=0 skip=2 total=20 from=summary
    --- drydock: end progress ---
    --- drydock: values at failure ---
      summary = {'pass': 17, 'fail': 1, 'error': 0, 'skip': 2}
    --- drydock: end values ---
    Traceback (most recent call last):
      File "value-004-conformance.py", line 18, in <module>
        assert summary["fail"] == 0 and summary["error"] == 0
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    AssertionError

## Post-build programmatic acceptance
- PASS: value-004-conformance (FEATURE-VALUE-004.md)
  intent: The implementation passes the authoritative corpus slice covering type, length, numeric predicates, conversions, and math functions.
  target interpreter: /mnt/c/Users/barlo/projects/drydock/.venv/bin/python3
  provisioning: not required
  return code: 0
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 18,
        "fail": 0,
        "error": 0,
        "skip": 2
      },
      "cases": [
        {
          "line": 1973,
          "program": "modulemeta | .deps | length",
          "status": "skip",
          "detail": "declared in exclusions.txt",
          "expect_failure": false,
          "expected": [
            "6"
          ],
          "actual": []
        },
        {
          "line": 1977,
          "program": "modulemeta | .defs | length",
          "status": "skip",
          "detail": "declared in exclusions.txt",
          "expect_failure": false,
          "expected": [
            "2"
          ],
          "actual": []
        }
      ]
    }

## Build summary
RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/parser.py
- jq_interpreter/evaluator.py
- tests/test_value_004.py

SUMMARY:
Implemented VALUE-004 type, length, UTF-8 length, conversions, numeric predicates, and math builtins. Scoped conformance: 18 passed, 0 failed, 0 errored. Tests: 76 passed.

BLOCKERS:
- None