core: Strip BOM in URLLoader text data

[Mesteery]

[Aaron1011]

Are you sure that this is done in URLLoader, and not in ByteArray? There's already some BOM-related logic in ByteArray, so I wonder if it just needs to be extended

[Mesteery]

Are you sure that this is done in URLLoader, and not in ByteArray? There's already some BOM-related logic in ByteArray, so I wonder if it just needs to be extended

According to uqers, in FP, URLLoader uses URLStream, so it's done in URLStream/readUTFBytes like in ByteArray

[Dinnerbone]

I would really appreciate a test for this!