[wp-trac] [WordPress Trac] #59453: Replace property_exists call in block api with instanceof

[WordPress Trac]

#59453: Replace property_exists call in block api with instanceof
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 Reporter:  spacedmonkey               |       Owner:  gziolo
     Type:  enhancement                |      Status:  closed
 Priority:  normal                     |   Milestone:  Future Release
Component:  Editor                     |     Version:  5.8
 Severity:  normal                     |  Resolution:  fixed
 Keywords:  has-patch gutenberg-merge  |     Focuses:  coding-standards
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Comment (by kebbet):

 I think this changeset was introduced in `6.4`, is that correct? Please
 milestone it accordingly @spacedmonkey, thanks!

 Trying to clean up committed tickets from the `Future release` milestone.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59453#comment:10>
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