Interesting information but these are not hard numbers.

Surely the 100-char string information of 141 bytes is not correct as it would only apply to ASCII 100-char strings.

It would be more useful to know the overhead for unicode strings presumably utf-8 encoded. And again I would presume 100-Emoji string would take 441 bytes (just a hypothesis) and 100-umlaut chars string would take 241bytes.