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evaluation of \w

From: Doug McIlroy
Subject: evaluation of \w
Date: Mon, 02 Mar 2020 11:24:03 -0500
User-agent: Heirloom mailx 12.5 7/5/10 
Why does this input echo "\w'0'"
.tm \w'0'
while this input echoes "5000"?
.nr w \w'0'
.tm \nw

Doug
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