Show every numeric value as a decimal with digits digits after the point (exact
values included: 3/2 becomes 1.50 with 2 digits).
integer from 0 to 100, or null to go back to the default display
(exact fractions, approximate values with 3 digits).
Display option of the objects that hold numeric values: show them as decimals with a fixed number of digits (
as***/with***family: chainable, returnsthis).The option is persistent and copied by
clone()(not bycopy(), like every display state). It applies to the values the object holds when it is called: an operation that builds new values afterwards starts again from the default display, so call it last, right beforetex/display.