Draft: fix: properly parse block & line comments

Summary

• fix: properly parse block & line comments

Related to #1268

This MR includes multiple whitespace fixes, since the exhaustive parsing test wouldn't properly work otherwise. However, it doesn't contain any whitespace test per se, so quite likely certain whitespace is still incorrect.

Closes #1324

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• Close #1324
• Cherry-pick to: none
• Docs follow-up: INSERT HERE
• [+] Changelog is updated