float-epsilon

float-epsilon is a variable defined in `cl.el'.
Its value is

nil

• This variable is an alias for `cl-float-epsilon'.
• This variable may be risky if used as a file-local variable.

Documentation:
The smallest positive float that adds to 1.0 to give a distinct value.
Adding a number less than this to 1.0 returns 1.0 due to roundoff.
For IEEE machines, epsilon is about 2.22e-16.
Call `cl-float-limits' to set this.