cl-least-positive-float is a variable defined in `cl-lib.el'.
Its value is
This variable may be risky if used as a file-local variable.
The smallest value greater than zero that a Lisp float can hold.
For IEEE machines, it is about 4.94e-324 if denormals are supported,
or 2.22e-308 if they are not.
Call `cl-float-limits' to set this.