I took a look at the code, and added

print "*** ($capsule) *** Result: ($result)\n";
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to the code. When I ran the code, I got

# capsule overload eval-ing : ${$_[0]} eq $_[1]
# capsule overload returning: 1
*** (It's a widget!) *** Result: ()
# result of comparison: false
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which seems to mean that the eq has failed. However, when I replace eq with =~, the code appears to work as you expected; however, then it appears to bypass the nomethod overload.

*** (It's a widget!) *** Result: (1)
# result of comparison: true
# result of comparison: false
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Likewise with substituting !~ for ne.

Wish I could be of more help,
-v

Update 1:

It appears as if nomethod fails to return anything even when hardcoded. I probably need to do more research.
-v

Update 2:

It looks like Capsule is looking for a nomethod in Widget, but failing to find that, invokes Capsule's nomethod. However, it appears to toss the value in what looks like a return through Widget. It should probably be run through the perl debugger will full tracing.

Sorry again,
-v