pipe handling of Process::launch seems to be wrong

[MalteSchledjewski]

I try to run a tool that uses TSCBasic.Process.checkNonZeroExit(arguments: arguments) in two threads. The called executable is the same but the arguments differ.

The second call errors with error: close error: Unknown error -1.
This comes from try close(fd: stdinPipe[0]) in Process::launch.