Add precision setting to all transformers that output dimensions or metric coordinates.

To negate the need to add AttributeRounders after (e.g. LengthCalculator) include a precision setting option in the initial transformer.

A default setting of 3 (mm) should suffice for most operations.

This setting could then be defined as a user parameter for use throughout a workspace.

A search shows discussions around precision dating back a decade ago, so I may be late to the party here.