Cast line_num to allow compilation with `-WConversion` #262

	---
	# Continuous Integration Workflow: Test case suite run + validation build check
	name: CI

	# Controls when the action will run.
	# Triggers the workflow on push or pull request events but only for the master branch
	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	# Job: Unit test suite
	unit-tests:
	name: "Unit Tests"
	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby: ['2.7', '3.0', '3.1', '3.2']
	steps:
	# Install Ruby Testing Tools
	- name: Setup Ruby Testing Tools
	run: \|
	sudo gem install rspec
	sudo gem install rubocop -v 1.57.2

	# Checks out repository under $GITHUB_WORKSPACE
	- name: Checkout Latest Repo
	uses: actions/checkout@v2

	# Run Tests
	- name: Run All Unit Tests
	run: \|
	cd test && rake ci

Provide feedback