drop dependence on golang.org/x/exp/constraints #303

	name: build
	on:
	push:
	branches:
	- generics
	paths:
	- '**.go'
	pull_request:
	branches:
	- generics
	paths:
	- '**.go'
	jobs:
	build:
	name: Test with coverage
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Setup Go
	uses: actions/setup-go@v4
	with:
	go-version: '1.22'
	- name: Run tests
	run: go test -race -coverprofile=profile.cov -coverpkg=./... ./...
	- name: Send coverage
	uses: shogo82148/actions-goveralls@v1
	with:
	path-to-profile: profile.cov

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