sizeRangeSuffixes doesn't work if the preview is embedded using base64 encoding

[nathanbiller]

Obviously, when a small image is encoded using base64 the name of the file is different. The sizeRangeSuffixes attempt to replace the suffix and ends up just appending it to the base64 encoding which then fails to load. Is there a way to notify the sizeRangeSuffixes that the original small preview is base64 encoded and to provide an alternative base URL with which to swap it out?