readFloatLe
Reads a 32-bit IEEE 754 float in little-endian order starting at offset.
The four bytes are decoded as with readIntLe and reinterpreted through Float.fromBits, so the exact bit pattern is preserved, including NaN payloads written by writeFloatLe.
Return
the decoded value.
Parameters
offset
the index of the first byte to read.
Throws
if offset is negative or offset + 4 exceeds the array size.