Fix `@val` shadowing (rewrite using globalThis) #9073

Job	Run time
build-compiler (windows-2025, 5.3.0, true, win32-x64, x86_64-pc-windows-gnu, .exe)	5m 48s
build-compiler (macos-15-intel, 5.3.0, true, darwin-x64, x86_64-apple-darwin)	7m 20s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, linux...	2m 53s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	3m 55s
build-compiler (macos-15, 5.3.0, true, darwin-arm64, aarch64-apple-darwin)	3m 46s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static, linux-x64, x86_64...	3m 5s
api-docs	1m 36s
pkg-pr-new	57s
test-installation-pnpm (windows-2025)	30s
test-installation-pnpm (ubuntu-24.04)	10s
test-installation-pnpm (macos-15-intel)	25s
test-installation-npm (windows-2025)	1m 7s
test-installation-npm (macos-15-intel)	37s
test-integration-rewatch (macos-15-intel)	2m 52s
test-installation-pnpm (macos-15)	17s
test-integration-rewatch (windows-2025)	2m 52s
test-installation-npm (macos-15)	15s
test-integration-rewatch (ubuntu-24.04)	1m 20s
test-integration-rewatch (ubuntu-24.04-arm)	1m 8s
test-integration-rewatch (macos-15)	1m 25s
test-installation-pnpm (ubuntu-24.04-arm)	18s
test-installation-npm (ubuntu-24.04-arm)	18s
test-installation-npm (ubuntu-24.04)	11s
publish	0s
	43m 5s

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