G64 and G20/G21 handling

How is G64 P- handled internally with G20/G21? Is the P value just a straight number that's interpreted according to whatever units are currently active? I don't see any mention of units at all in the docs.

FreeCAD is changing up its postprocessors, and I'm trying to figure out if

G20
G64 P0.01
G21

is the same as

G21
G64 P0.01

Thanks!


ETA- Now that I look at it, the order is still the same as the old FreeCAD postprocessors, but I'd still like to know. It seems weird to me to see G64 before either G20/G21 appears, but if it's literally just setting a number that has zero unit awareness, it's not actually a problem.

In axis i get this:

G20 G64 P0.05

 



G21 G64 P0.05

 

Where are you seeing that? I don't recall seeing the blending tolerance displayed anywhere, though I suspect I'm just being blind.

That answer works well enough for my purposes- regardless of whether that means "always uses mm" or "always uses machine units".

Axis UI => Machine menu => Show LinuxCNC Status => settings


or from linuxcnc.stat attributes
linuxcnc.org/docs/stable/html/config/pyt...ding_linuxcnc_status

settings
    (returns tuple of floats) - current interpreter settings. settings[0] = sequence number, settings[1] = feed rate, settings[2] = speed, settings[3] = G64 P blend tolerance, settings[4] = G64 Q naive CAM tolerance.