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Remove the case that dict·update can take None #334

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Remove the case that dict·update can take None #334

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3 changes: 1 addition & 2 deletions spec.md
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Expand Up @@ -3811,8 +3811,7 @@ x # {"one": 1, "two": 2, "three": 3, "four
`D.update([pairs][, name=value[, ...])` makes a series of key/value
insertions into dictionary D, then returns `None.`

If the positional argument `pairs` is present, it must be `None`,
another `dict`, or some other iterable.
If the positional argument `pairs` is present, it must be `dict`, or some other iterable.
If it is another `dict`, then its key/value pairs are inserted into D.
If it is an iterable, it must provide a sequence of pairs (or other iterables of length 2),
each of which is treated as a key/value pair to be inserted into D.
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