Which @angular/* package(s) are relevant/related to the feature request?

common

Description

A common way to display currencies (at least in US) is to omit the cents if the price is a round number, or to show two digits if the price is not a round number.
For example, for 3 dollars, $3, and for 3.1 dollar, $3.10.

There is no way to accomplish this with the current currency pipe, which only takes a range for the number of digits after the decimal. The only options either make the first price $3.00 and the second $3.10, or the first price $3 and the second $3.1.

Proposed solution

Extend the digitsInfo format. Currently, the format is {minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}.
As an alternative, we could offer {minIntegerDigits}.{allowedFractionDigits1},{allowedFractionDigits2}[,...]. So the digitsInfo for the format above would be 1.0,2.

Alternatives considered

Alternately, one could use an *ngIf to change out the element with the currency, and use two elements, each with a currency pipe to accomplish the above. Obviously, that is kind of messy.