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Changes between Initial Version and Version 1 of Ticket #43421, comment 2

initial	v1
12	12	}}}
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	14	and the Codex examples show this, too: https://codex.wordpress.org/Function_Reference/add_role#Example
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14	16	You have to pass both these things. When you pass `$userCaps = [ 'read', 'my_cap', ];` you are effectively passing in the following array: `[ 0 => 'read', 1 => 'my_cap' ]`, which in turn tries to perform two calls: `add_cap( 0, 'read' )` and `add_cap( 1, 'my_cap' )`, which is, indeed, incompatible with what you're trying to achieve.
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