Inconsistent method return when IP address is invalid

[amh4r]

When the IP address is invalid, some methods throw errors while others return something. There are also a couple methods (e.g. href()) which don't return falsy values. Should this be more consistent? I like how like all boolean methods (e.g. isValid()) return false when the IP address is invalid, but it seems like the others should all throw errors or return null.

The following code calls each method on Address6 when the IP address is invalid.

const Address6 = require('ip-address').Address6
const address = new Address6('intentionally invalid')

for (let key of Object.keys(address.__proto__).sort((a, b) => a < b ? -1 : 1)) {
    if (typeof address[key] === 'function') {
        try {
            console.log(`   OK:  ${key}() = ${address[key]()}`)
        } catch (error) {
            console.log(`ERROR:  ${key}()`)
        }
    }
}

This is the output:

   OK:  bigInteger() = null
ERROR:  binaryZeroPad()
   OK:  canonicalForm() = null
   OK:  correctForm() = null
   OK:  decimal() = null
ERROR:  endAddress()
ERROR:  getBits()
   OK:  getBitsBase16() = null
ERROR:  getBitsBase2()
ERROR:  getBitsPastSubnet()
ERROR:  getScope()
   OK:  getType() = Global unicast
ERROR:  group()
   OK:  href() = http://[null]/
ERROR:  inspect6to4()
ERROR:  inspectTeredo()
   OK:  is4() = false
   OK:  is6to4() = false
   OK:  isCanonical() = false
   OK:  isCorrect() = false
   OK:  isInSubnet() = false
   OK:  isLinkLocal() = false
   OK:  isLoopback() = false
   OK:  isMulticast() = false
   OK:  isTeredo() = false
   OK:  isValid() = false
   OK:  link() = <a href="/#address=null">null</a>
ERROR:  mask()
ERROR:  microsoftTranscription()
ERROR:  parse()
ERROR:  parse4in6()
   OK:  possibleSubnets() = 1
ERROR:  regularExpression()
ERROR:  regularExpressionString()
ERROR:  reverseForm()
ERROR:  startAddress()
ERROR:  to4()
ERROR:  to4in6()
   OK:  to6to4() = null
ERROR:  toByteArray()
ERROR:  toUnsignedByteArray()