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Use this to apply a validator/converter to each item in a list.
For instance::
ForEach(AsInt(), InList([1, 2, 3]))
Will take a list of values and try to convert each of them to
an integer, and then check if each integer is 1, 2, or 3. Using
multiple arguments is equivalent to::
ForEach(All(AsInt(), InList([1, 2, 3])))
Use convert_to_list=True if you want to force the input to be a
list. This will turn non-lists into one-element lists, and None
into the empty list. This tries to detect sequences by iterating
over them (except strings, which aren't considered sequences).
ForEach will try to convert the entire list, even if errors are
encountered. If errors are encountered, they will be collected
and a single Invalid exception will be raised at the end (with
error_list set).
If the incoming value is a set, then we return a set.
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