[snek]

> and did you know that IEEE-754 floating point can represent a "negative zero" that you can use for an error code in functions that return float or double?

I am begging, please never ever do this. NaN literally exists for this reason. NaN even allows you to encode additional error context and details into the value.

[saagarjha]

+DBL_MAX. Negative zero is an entirely valid, if rare, result of certain computations.

[pwdisswordfish2]

IEEE 754 has infinities as well, no need to constrain yourself to DBL_MAX :)