we decided to transliterate our 90k lines of Python directly to Go, line by line
The 90K number includes our tests, but without tests, the Python codebase is 36,784 lines of code. Those same lines
of code became 41,717 lines of Go code. So, not that much of an increase. When you consider that's just 4,933 more lines, it's not crazy to assume most of those are closing braces.
I'd say closing braces and trivial expansions of list comprehensions into 3-5 line loops.
There's a real life example of direct transliteration, not just a rewrite. That's 13.4% more lines. I think that's pretty close.