This exact thing has happened to me, and it was both a surreal and wonderful experience to realize that I had helped myself across a huge gap of time (3+ years)

This exact thing has happened to me, and it was both a surreal and wonderful experience to realize that I had helped myself across a huge gap of time (3+ years). It provides an even better motivation to help others with technical problems online: we can forget things that we're experts at. It underlines why it is so important to have natural language descriptions of problems that point to correct answers.