Don't allow invalid Unicode scalar values in `char` #1852

Job	Run time
Clippy	5m 5s
Clippy	5m 5s
Check	54s
Check	54s
Verify that web-sys is compiled correctly	55s
Verify that web-sys is compiled correctly	55s
Rustfmt	6s
Rustfmt	6s
Run js-sys crate tests	2m 8s
Run js-sys crate tests	2m 8s
Run wasm-bindgen crate tests (unix)	10m 15s
Run wasm-bindgen crate tests (unix)	10m 15s
Run wasm-bindgen crate tests with multithreading enabled	3m 22s
Run wasm-bindgen crate tests with multithreading enabled	3m 22s
Run native tests	1m 40s
Run native tests	1m 40s
Run web-sys crate tests	4m 0s
Run web-sys crate tests	4m 0s
Run wasm-bindgen-webidl crate tests	1m 59s
Run wasm-bindgen-webidl crate tests	1m 59s
build_benchmarks	45s
build_benchmarks	45s
build_examples	3m 7s
build_examples	3m 7s
build_nightly	48s
build_nightly	1m 38s
dist_linux_aarch64_gnu	2m 36s
dist_linux_aarch64_gnu	2m 36s
dist_linux_x86_64_musl	2m 20s
dist_linux_x86_64_musl	2m 20s
dist_macos_aarch64	3m 55s
dist_macos_aarch64	3m 55s
dist_macos_x86_64	1m 49s
dist_macos_x86_64	1m 49s
dist_windows	2m 28s
dist_windows	2m 28s
doc_api	1m 7s
doc_api	1m 7s
doc_book	4s
doc_book	4s
Build and test the deno example	45s
Build and test the deno example	45s
Test TypeScript output of wasm-bindgen	1m 6s
Test TypeScript output of wasm-bindgen	1m 6s
Run UI compile-fail tests	45s
Run UI compile-fail tests	45s
test_examples	0s
test_examples	1m 56s
deploy	0s
deploy	31s
	1h 47m 15s

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