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> the Template -> string function

There is no such function; Template.__str__() returns Template.__repr__() which is very unlikely to be useful. You pretty much have to process your Template instance in some way before converting to a string.

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Right, but it is possible to write a template -> string function that doesn’t sanitise and use it (or more realistically use the wrong one). Just as it’s possible to unsafely cast an unsafe string to a sanitised one and use it (rather than use a sanitise function that returns the wrapper type).

They are both similar in their unsafety.

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