str: use generic instead of `impl Trait` #71

# to view logs

	# This clippys, docs, tests, builds.

	name: CI

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	env:
	CARGO_TERM_COLOR: always
	RUST_BACKTRACE: "full"
	RUST_MIN_STACK: 8000000

	jobs:
	# Run format separately.
	#
	# This will fast-cancel other CI early if this fails.
	#
	# `cargo fmt` checks _all_ code, regardless of the OS
	# or any `#[cfg]`'s, so this only needs to run on Linux.
	fmt:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: recursive
	- name: Format
	run: cargo fmt --all --check

	ci:
	runs-on: ${{ matrix.os }}

	strategy:
	matrix:
	os: [windows-latest, macos-latest, ubuntu-latest]

	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	submodules: recursive

	- name: Cache
	uses: actions/cache@v3
	with:
	path: target
	key: ${{ matrix.os }}

	- name: Clippy
	run: cargo clippy --release --all-features

	- name: Test
	shell: bash
	run: cargo test --release --all-features -- --skip float::tests::special --skip int::tests::special --skip percent::tests::special --skip runtime::tests::special --skip unsigned::tests::special

	- name: Build
	shell: bash
	run: \|
	cargo build --release --all-features
	# Build all features, individually.
	for feature in "byte" "date" "num" "run" "time" "up"; do
	cargo build --release --no-default-features --features $feature
	done

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