Exclude data that are not real currencies

[dianaaceves]

Hi, first of all thanks for your library, it's very useful!

I'm working with it and I see that in the array there are data that are not really coins, but are data for testing, and other objects that I don't even know if they are coins (I leave you some examples).
{
"code": "XXX",
"number": "999",
"digits": 0,
"currency": "The codes assigned for transactions where no currency is involved",
"countries": [
"Zz07_no_currency"
]
}
{
"code": "XTS",
"number": "963",
"digits": 0,
"currency": "Codes specifically reserved for testing purposes",
"countries": [
"Zz06_testing_code"
]
}
{
"code": "XPD",
"number": "964",
"digits": 0,
"currency": "Palladium",
"countries": [
"Zz09_palladium"
]
}
{
"code": "XPT",
"number": "962",
"digits": 0,
"currency": "Platinum",
"countries": [
"Zz10_platinum"
]
}
{
"code": "XUA",
"number": "965",
"digits": 0,
"currency": "ADB Unit of Account",
"countries": [
"Member Countries of the African Development Bank Group"
]
}
{
"code": "XDR",
"number": "960",
"digits": 0,
"currency": "SDR (Special Drawing Right)",
"countries": [
"International Monetary Fund (Imf) "
]
}

Is there any way to know which data are actually coins? I wanted to use the library in production but it doesn't work, because I don't know what data I have to exclude.

Thank you.