Re: [img-conversion] canDecodeType and canEncodeType (#18)

It is designed to work the same as HTMLMediaElement.canPlayType(), which returns "" (not supported), "maybe" or "probably". Supporting a format is a complex question so these are designed to provide a confidence level rather than just yes/no. I (perhaps naively) copied this approach for images.

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https://github.com/WICG/img-conversion/issues/18#issuecomment-155774441