formatHms

Formats this duration as hours, minutes, and seconds, such as "1h 23m 45s".

Leading zero units are omitted ("1m 5s", "5s"), inner zero units are kept ("1h 0m 5s"), and Duration.ZERO formats as "0s". Values are truncated to whole seconds, negative durations get a leading minus sign, and infinite durations format as "Infinity".