klog.go (6 lines):
	- line 266: // Lock because the type is not atomic. TODO: clean this up.
	- line 311: // TODO: check syntax of filter?
	- line 352: // Lock because the type is not atomic. TODO: clean this up.
	- line 455: // compatibility. TODO: does this matter enough to fix? Seems unlikely.
	- line 648: buf.nDigits(7, 22, pid, ' ') // TODO: should be TID
	- line 1028: // TODO: set 'severity' and caller information as structured log info