Conversion from char (byte) to float

[Marcin Puchlik]

Conversion from byte to float works wrong (in my opinion) for byte
variables greater than 127. Correct me if I'm wrong: char/byte range is
from 0 to 255 (included). In GNU Radio, after conversion from char/byte
variable type (that is greater than 127) to float, the result is negative.
Seems like range for byte in GNU Radio is from -128 to 127. Can somebody
confirm it? I am asking for clarification.