Fix GitHub username error comparing type

[scc-tw]

If anyone's username is full numerical string the mdParser would
deduct it as a number rather than a string. Therefore there should
have a type-casting when it would be compared via type-sensitive
compare operator.

Please check: 59db69c and #1975

[scc-tw]

Hey all, I update the PR link. Please feel free to check it.

[juanpflores]

🙌🏼 Thanks for pointing this out! I'll check the pull request you submitted with the team ⭐