NumberFormatter output string is incorrect due to loss of precision

When the NumberFormatter() is asked to output Decimal/NSDecimalNumber values with more than 15 fractional digits, the output is rounded (apparently to the precision of Double numbers). Example:

14 decimals: 3.14159265358979
15 decimals: 3.141592653589793
16 decimals: 3.1415926535897900
17 decimals: 3.14159265358979000
18 decimals: 3.141592653589790000
19 decimals: 3.1415926535897900000
20 decimals: 3.14159265358979000000

Note the trailing zeros which are not expected.

Note that Decimal numbers support a precision of 38-decimals. Example: Decimal.pi.description

3.14159265358979323846264338327950288419

Code to reproduce the rounding problem:

import Foundation

var number = Decimal.pi
let formatter = NumberFormatter()

for width in 10 ... 38 {
    formatter.maximumFractionDigits = width
    formatter.minimumFractionDigits = width
    print(String(width) + " decimals: " +
            (formatter.string(from: number as NSDecimalNumber) ?? ""))
}

Apple feedback ID: FB9835108