TOML is a very popular format now, and is taking hold in the Python
ecosystem via pyproject.toml (among others). This allows toml config
files via,
    app.config.from_file("config.toml", toml.loads)
it also allows for any other file format whereby there is a loader
that takes a string and returns a mapping.

pgjones added a commit to pallets/quart that referenced this pull request

This alters  e49d4f6  and follows
discussion in Flask about how best to support this functionality. With
this change Quart matches the Flask functionality.
See pallets/flask#3398.

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