FEATURE REQUEST: parse from data (string) already in RAM, not from disk file

[weshatheleopard]

I receive a PBF from a web server. As a result, I have all the necessary data in RAM. But it looks like the only way to pass that data to this gem is to save it to the disk, and then pass the file name to the gem so it can read the file. This is an unnecessary step, the gem should be capable of reading the data directly from RAM.