Implement type choice extensions #643

	# GitHub Actions - CI for Go to build & test. See ci-go-cover.yml and linters.yml for code coverage and linters.
	# Taken from: https://github.com/fxamacker/cbor/workflows/ci.yml (thanks!)
	name: ci
	on: [push, pull_request]
	jobs:

	# Test on various OS with default Go version.
	tests:
	name: Test on ${{matrix.os}}
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [macos-latest, ubuntu-latest]
	steps:
	- name: Checkout code
	uses: actions/checkout@v2
	with:
	fetch-depth: 1
	- name: Install mockgen
	run: \|
	go install github.com/golang/mock/[email protected]
	- name: Build project
	run: go build ./...
	- name: Run tests
	run: \|
	go version
	make test

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