PR Summary

#8785 exposed an issue where part of that optimization is seeing if the object has special remoting note properties. One of them was simply called Length and if so then formatting simply used ToString() which is undesired in this case. This is a very specific case where it is an object that contains only a member called Length. Searching the codebase, it appears SourceLength isn't actually used, so the fix is to remove this property and the check for it.

PR Context

Fix #10762

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