Running `dot share/misc/committers-ports.dot` should not produce the following messages:
> Warning: syntax ambiguity - badly delimited number '0m' in line 43 of share/misc/committers-ports.dot splits into two tokens
> Warning: syntax ambiguity - badly delimited number '0m' in line 484 of share/misc/committers-ports.dot splits into two tokens
> Warning: syntax ambiguity - badly delimited number '0m' in line 530 of share/misc/committers-ports.dot splits into two tokens