Setting data-preamble

[emlyn]

Is there a way to set the data-preamble on all snippets, or on a particular snippet?

I am writing interactive docs for a library which has a function for overriding the default behaviour (by setting a dynamic var), and I'd like to make sure it's set back to the default at the start of each snippet.

I suppose I could process the generated files to add the data-preamble in myself, but it would be better to avoid an extra step if possible.

[workshub]

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