there was this other, similar town pronounced -bruh or -boro that people talked about.

You were so close: Edinburgh only got its name after Edward I invaded Scotland in 1296. Before that it (which was then a larger area than the present Edinburgh) had just been called “the Burgh”, which depending on regional variation would have been pronounced either “burg” or “boro”. “Edinburgh” referred to a smaller area within the Burgh that the king’s guards would patrol more severely due to the perceived increased risk of rebellion due to higher population density.

(/joke)

Reading through their mail merge tutorial, their method looks insanely risky: putting all addresses in “to” and rembering to click another button.

That’s really interesting. So does that mean the interpreter just checks whether the current line is more indented, less indented, or equal vs. the preceding, without caring by how much?

Please elaborate (eg which standard is this defined in?)