Update: I agree with chromatic's point. When I thought of the solution below, I erroneously conflated the OP's problem with a different one (one resulting from using ref to detect whether something is an 'ARRAY').

Use UNIVERSAL::isa instead. I.e. 

UNIVERSAL::isa( $value, "Node" )

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the lowliest monk

In reply to Re: isa() on any scalar by tlm
in thread isa() on any scalar by mrborisguy

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