it seems to be a question of why the extra braces are required.

The outer %{ ... } is a hash dereference.

The inner { ... } creates a hash and returns a reference to it.

In your first snippet, you have a hash dereference, but no hash.

In reply to Re^2: Fixing: Experimental keys on scalar is now forbidden by ikegami
in thread Fixing: Experimental keys on scalar is now forbidden by TheVend

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