add quick return in toStructure() for primitive values #1352
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The toStructure function is run on every element being sent over bolt, which loops over all available typeTransformers and checks if they're valid for transforming what is being sent to a structure. This is rather wasteful for things like strings and numbers, which we do not have any transformers for.
Based on a suggestion in #1351, the improvement will only work for as long as we do not have any transformers for primitive types, but there are currently no plans which would require that.