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Would it be easier to check if
image/svg+xmlis inbuilder.supported_image_types?There was a problem hiding this comment.
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AFAIU,
builderis just a name/string (http://www.sphinx-doc.org/en/stable/templating.html#global-variables).There was a problem hiding this comment.
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Oh, that's too bad; seems like it would have been more future-proof that way.