HandlerSocket creates non-world-readable unix sockets

[WheresWardy]

I'm having a problem where specifying a UNIX socket as the port parameter in my.cnf creates sockets that aren't read/writable by "other", only by user and group, i.e. srwxrwx--x. This means I can't read the socket from client programs that I don't want to escalate privileges for. MySQL creates a world-read/writable socket, where I'd like the same to happen for HandlerSocket, unless there's something I'm missing?