This bug happens when running on a live server, but not in Studio.
The code appears to work fine when not compiled under an Actor.
One aspect is that it causes a constant somewhere to be forgotten and results in the following behavior from this print call:
-- code snippet
print(1, 2, 3, 4, 5, "a", "b", "c", "d", "e")
return smul*(coef/2^52 + 1)*2^(pow - 1023)
--> 1, 2, 3, 4, 5, b, c, d, e, 4503599627370496
4503599627370496 is 2^52, the next constant defined in my code
Place can be found here: Native Bug Repro - Roblox
Relevant file is game.ReplicatedStorage.SharedModules.Utils.Serializer
Here is video demonstration of the bug for more context:
