func decodeBody<Body: Codable>(_ type: Body.Type) is in error

[joemichels]

I believe the function decodeBody has an error, but I'm not sure.
The function:
public func decodeBody<Body: Codable>(_ type: Body.Type) throws -> Body? {
guard case let .data(bodyData, format)? = body else { return nil }
switch format {
case .json: return try JSONDecoder().decode(type, from: bodyData)
default: throw UnsupportedBodyFormatError(format)
}
}

should not be using .data but I think .codable.

The following code shows what I'm trying to do:
if let iapError = error as? IapStatusCode
{
if iapError.rawValue != IapStatusCode.maliformed.rawValue
{
XCTFail("The wrong error type was returned")
}
print("Not a valid receipt Apple Says: (iapError.errString)")
let theErr = RequestError(rawValue: 204, reason: iapError.errString)
let returnError = RequestError(theErr, body: iapError)
HERE:::: I'm calling REquestError with iapError of type IapStatusCode. This works as expected

 	let theIAPStatusCode = returnError.bodyAs(IapStatusCode.self)

HEEr::: theIAPStatusCode returns nil because of the: [guard case let .data(bodyData, format)? = body else { return nil }] I think it should be .codable

if theIAPStatusCode != IapStatusCode.maliformed
{
	XCTFail("Return Error Incorrect")
}

}