Fix `@val` shadowing (rewrite using globalThis) #9072

Job	Run time
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	5m 45s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	13m 33s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	3m 47s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	2m 34s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	3m 40s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	3m 19s
pkg-pr-new	53s
api-docs	1m 30s
test-installation-pnpm (windows-2025)	29s
test-installation-pnpm (ubuntu-24.04)	13s
test-installation-pnpm (macos-15)	13s
test-installation-npm (windows-2025)	1m 12s
test-installation-pnpm (ubuntu-24.04-arm)	17s
test-installation-npm (ubuntu-24.04)	16s
test-installation-npm (ubuntu-24.04-arm)	18s
test-integration-rewatch (windows-2025)	2m 50s
test-installation-npm (macos-15)	18s
test-integration-rewatch (ubuntu-24.04-arm)	1m 7s
test-installation-pnpm (macos-15-intel)	36s
test-integration-rewatch (ubuntu-24.04)	1m 20s
test-installation-npm (macos-15-intel)	24s
test-integration-rewatch (macos-15-intel)	2m 22s
test-integration-rewatch (macos-15)	1m 26s
publish	-1s
	48m 21s

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