Preserve prototype-named keys in Zod maps

[schani]

z.record reconstructs decoded maps through plain-object assignment, which drops an own __proto__ key. Decode validated entry tuples with Object.fromEntries, preserving prototype-named keys, value transforms, and inferred record types.

The API test executes generated Zod code with a null-prototype input, verifies the output has an ordinary prototype and an own __proto__ descriptor, rejects Date/Map/Set inputs like z.record, and typechecks inferred numeric values. The shared JSON regression lands in downstream #3519.

Production diff: 9 additions, 1 deletion.

Validation: build; lint; API unit; TypeScript Zod fixtures 145/145.

[github-actions]

Generated-output differences

47 files differ — 47 modified, 0 new, 0 deleted
574 changed lines — +428 / −146

Open the generated-output report →

[schani]

No comments here either!

[schani]

Added API tests in test/unit/typescript-zod-map-helper.test.ts. They execute generated code, preserve an own __proto__ key from a null-prototype input, verify the returned property descriptor and ordinary prototype, reject Date/Map/Set, typecheck inferred map values, and confirm the helper is absent without maps.

[github-actions]

Generated-output differences

47 files differ — 47 modified, 0 new, 0 deleted
574 changed lines — +428 / −146

Open the generated-output report →

[github-actions]

Generated-output differences

47 files differ — 47 modified, 0 new, 0 deleted
574 changed lines — +428 / −146

Open the generated-output report →