Description

Currently DateTimeNormalizer always uses datetime->format($format) so it's logical when expecting human readable dates to get as strings, but one could expect that when providing "U" format to get an integer or "U.u" to get float.

In meilisearch/meilisearch-symfony#304 we have a need for this, because meilisearch api expects dates to be indexed as integers.

So I think this could be a good addition, but of course for BC reasons we'd need to add additional context key to enable this.

Example

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