250k items is not enough for your history file? Also, fish shares the history between the shells out of the box, unlike zsh... but it chose to do it in a diffe

250k items is not enough for your history file? Also, fish shares the history between the shells out of the box, unlike zsh... but it chose to do it in a different way (that is, commands are available even if one of the shells hasn't been closed, unlike bash... but they aren't available right away after entering a single new command, like most zsh configurations that I've seen)