Fix #7040 preserve enum type for numeric DefaultValueAttribute defaults

[michaelstaib]

Fixes #7040

• Added a regression test for enum input defaults coming from underlying numeric values (the shape produced by F# metadata in this scenario).
• Updated default value handling to coerce numeric enum-underlying defaults back to the configured enum type when the argument/input field type is already enum-typed.
• This prevents DefaultValueAttribute defaults like 0 from overriding the input field type to Int.

[github-actions]

Fusion Gateway Performance Results

Progress: 0/6 benchmarks completed — this report updates as each job finishes.

Simple Composite Query

	Req/s	Err%
Constant 2 (50 VUs)	pending	pending
Ramping 2 (0-500-0 VUs)	pending	pending

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 2	pending	pending	pending	pending	pending	pending
Ramping 2	pending	pending	pending	pending	pending	pending

---

Deep Recursion Query

	Req/s	Err%
Constant 2 (50 VUs)	pending	pending
Ramping 2 (0-500-0 VUs)	pending	pending

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 2	pending	pending	pending	pending	pending	pending
Ramping 2	pending	pending	pending	pending	pending	pending

---

Variable Batching Throughput

	Req/s	Err%
Constant 2 (50 VUs)	pending	pending
Ramping 2 (0-500-0 VUs)	pending	pending

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 2	pending	pending	pending	pending	pending	pending
Ramping 2	pending	pending	pending	pending	pending	pending

---

Runner 2 = benchmarking-2

Run 22499411463 • Commit 66cbe00 • Fri, 27 Feb 2026 18:49:56 GMT