Validate integer-valued floating-point inputs consistently

[quinnj]

Validating Float32(3) against type="integer" returned a type error, although Float64(3) passed. The same mismatch affected Float16 and BigFloat, including values inside arrays and object properties.

Apply the existing isinteger check to AbstractFloat. This follows draft-07 section 6.1.1, which defines integer instances by their fractional part. It avoids converting large values to a machine integer. Fractions, NaN, infinities, and Boolean instances remain rejected by integer schemas.

Validation:

• All 111 public regression assertions pass on Julia 1.9.4 and 1.13.1. The prior tree passes 77 and fails 34 on both versions.
• Full package suites pass 5,799 assertions on both versions with bounds checks.
• Controls cover Float16/32/64/BigFloat, signed zero, nullable unions, nested error locations, existing Float64 behavior, and a BigFloat above machine-integer range.
• JuliaFormatter 2.14.0, git diff --check, and an independent private review pass. All seven hosted checks pass at 03750bbf34430956460496a8664b93e69e5f87bb. All six native coverage uploads were accepted for the correct repository/head and finished processing; aggregate coverage is 96.46%. The ordinary squash merge is bcaa1be86dee593e917daf200d1208d3d2d49eb7, whose tree equals the locally tested head. Both main workflows and all seven jobs pass; all six main uploads were also accepted and processed at 96.46%.

Co-authored by Codex

AI disclosure: This work was prepared with assistance from OpenAI Codex.

[quinnj]

Merged as bcaa1be86dee593e917daf200d1208d3d2d49eb7 after all seven head checks passed and all six exact-head coverage uploads were accepted and processed. The merged tree equals the reviewed and locally tested head. Both main workflows now pass all seven jobs; all six main uploads were accepted for this repository/commit and processed (96.46%). Local full suites passed 5,799 assertions on Julia 1.9.4 and 1.13.1.

AI disclosure: This work was prepared with assistance from OpenAI Codex.