fix(core): Stacks from 3rd-party libraries do not synthesize correctly #10690
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Even though this is arguably somewhat of an antipattern and user error:
Stack
s from libraries.NPM can dedupe it (or use
peerDependencies
to avoid this altogether)This is still a sharp edge that we can blunt a little by not using
the
instanceof
language feature.No test because it needs a second copy of the CDK to expose it.
Fixes #10671.
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