Why does Chrome use sec-ch-ua including "Not A Brand"?
[client-hints] GREASEing the Sec-CH-UA list
Randomizing order and string with escaped characters to ensure proper parsing and prevent ossification.
Source: user agent - Why does Chrome use sec-ch-ua: “"Not\A;Brand”;v=”99”? - Stack Overflow
That’s really interesting. It’s random and wrong on purpose.
Golang does something similar: randomize iteration order of small maps. Iteration is in a random order so that developers don’t depend on it always incrementing.