[1.42] write mode "wb," "ab," "rb" return nil?

decided to test my compression code in 1.42, see how much the new java-based bit api improved it's performance, and found the code crashing. Soem testing and it seems modes wb, ab, and rb all return nil when passed to open() on fs or io. D:

I just discovered the same thing. I'm currently using an alternative by reading the file as text and then converting the chars to their decimal value using string.byte(char).

Thanks for the report. Fixed for the next version.