Ensure a user exists in get_comment_author().

props azaozz.
see #24084.

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Initialize kses filters if _wp_unfiltered_html_comment nonce isn't set.

See #24752.

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Don't cast the 'm' query variable to an integer as the value can exceed the range of a 32-bit signed integer.

props Viper007Bond.
fixes #24884.

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WP_Date_Query.

props Viper007Bond.
see #18694.

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