readChars outputs converted bytes instead of actual chars

[bustedbunny]

Describe the bug
readChars outputs converted bytes instead of actual chars.
spaces end up being "+" and other symbols are converted just like bytes aswell.

How To Reproduce
I reproduce it this way.

  size_t s = req->readChars(buffer, 255);
  buffer[s] = '\0';
  Serial.println(buffer); 

Expected Behavior
I expect to get actual readChars function. same way it works with Stream.readChars() on arduino function. It returns actual characters. If I read serial this way, I get exactly same symbols I type.

Actual Behavior
Using readChars function from this library returns converted bytes into chars. So, instead of spaces I get "+".

ESP32 Module
NodeMCU-32S

Software (please complete the following information if applicable)

• Arduino IDE 1.8.13
• OS: Windows 10
• Chrome

Additional context
Judging by source code of library, there is somewhere a conversion to byte, between actual reading of data and readChars function, that causes this behaviour.