I recently noticed a bug whereby modules transferred from the application
bundle to the modules bundle would lose their application-specific import
extensions, since all modules installed in the modules bundle have only
.js and .json as import extensions, matching default Node behavior.
This commit fixes that bug by emitting one meteorInstall call per distinct
meteorInstallOptions object. This logic would work if every module had a
different meteorInstallOptions object, but in practice the modules bundle
should end up with exactly two meteorInstall calls, because a single
options object is shared among all modules from the same source batch.
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