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<p>Call a Ruby object method passing Swift code as a block used immediately.</p>
<p>This version is for something like <code>Enumerable#each</code> where the block is used
only in the context of this method and never again.  The Swift closure does not have
to be escaping or sendable.</p>
<p>If the method you’re calling retains the block in some way, associating it with the called
or returned object 