Use type predicate on isDecimal

[dmarkow]

Type Predicates help to narrow down types. Before this change:

const value: Decimal | string = "123";

if (Decimal.isDecimal(value)) {
  // do something
} else {
  // Typescript still thinks value can be a Decimal or string
}

After:

const value: Decimal | string = "123";

if (Decimal.isDecimal(value)) {
  // do something
} else {
  // Typescript now knows value is a string
}

[MikeMcl]

Yes, seems sensible. Thank you.

[markogresak]

@MikeMcl do you have a timeline to release a patch version on npm to include this type change?

[MikeMcl]

@markogresak

Published v10.4.0.

Thanks for the nudge.