Function asCustom

asCustom<T>(decodeFn, testFn?, name?): Decoder<T>
A way of creating custom decoders that can decoder a value into a specified type T. Useful only when utility for decoding your desired value doesn't exist.

example:
```
// a decoder for decoding a string that should be one of 3 valid
// values: 'accepted', 'rejected', 'in-review'
const customDecoder = asCustom((value) => {
     if (value === 'accepted' || value === 'rejected' || value === 'in-review')
         return success(value)
     return failure(`failed to decode value, expected one of 'accepted', 'rejected', 'in-review' but got ${value}`)
}, 'status decoder')
```
Type Parameters
- T
Parameters
- decodeFn: ((arg) => DecodingResult<T>)
  a decode function used in decoding a value to type T
  - - (arg): DecodingResult<T>
    - Parameters
      arg: unknown
      Returns DecodingResult<T>
- Optional testFn: ((arg) => boolean)
  an optional test function used in testing a value for conformity to type T
  - - (arg): boolean
    - Parameters
      arg: unknown
      Returns boolean
- Optional name: string
  an optional name of your custom decoder
Returns Decoder<T>
a new Decoder

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