Returns the single CBOR element if this is a 'single' variant.
The walk element to extract from
The CBOR value if single, undefined otherwise
const element: WalkElement = { type: 'single', cbor: someCbor };const cbor = asSingle(element); // Returns someCbor Copy
const element: WalkElement = { type: 'single', cbor: someCbor };const cbor = asSingle(element); // Returns someCbor
Returns the single CBOR element if this is a 'single' variant.