And internally floats are stored in the string-slot of a variable
No they're not. An xpvnv has separate slots for an int, a float and a string:
[davem@pigeon bleed]$ p -MDevel::Peek -e'$x=1; $x=2.2; $x = "three"; D
SV = PVNV(0x1ae3150) at 0x1b021d0
REFCNT = 1
FLAGS = (POK,pPOK)
IV = 1
NV = 2.2
PV = 0x1afb360 "three"\0
CUR = 5
LEN = 16
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