[wp-trac] [WordPress Trac] #58943: Replace `is_a` calls in core with `instanceof`

[WordPress Trac]

#58943: Replace `is_a` calls in core with `instanceof`
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 Reporter:  ayeshrajans                    |      Owner:  (none)
     Type:  enhancement                    |     Status:  new
 Priority:  normal                         |  Milestone:  Awaiting Review
Component:  General                        |    Version:  trunk
 Severity:  trivial                        |   Keywords:  has-patch
  Focuses:  performance, coding-standards  |
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 Replaces all `is_a` function calls with `instanceof` keyword, which in
 theory should be faster, and provides more code clarity. The replacements
 use extra braces to enhance the clarity although they are technically not
 necessary.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58943>
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