Does your null have teeth? — resampling nulls that bite

Scenario

memory ρ0.90 length n900

block size20

— —

repetitions200

verdict

—

the series and one draw of the null

data one null draw

null distribution

null samples 95% central interval observed

The floats are not bit-exact and this page does not claim they are: x**2 in CPython routes to the system libm, which is not correctly rounded, so every float is compared within a measured 1 ULP with the bound declared at 4. No cross-language port can be bit-exact there.
The verdict speaks about the five resamplers and the two invariants this page implements. An invariant outside those two, or a resampler outside those five, stays NO_MEDIDO — neither a pass nor a failure.