Shortcut hash computation for constant rules #28
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This reduces the number of hashing operations performed substantially
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I noticed that this implementation is always computing the per-rule hash. Most targetting cases are either including or excluding all users which pass the condition.
Shortcutting these always pass / always fail cases will substantially reduce the number of string concatenation and hashing operations performed in this hot loop of rule evaluation.
Some other clients already have this optimisation:
https://github.com/statsig-io/js-client-monorepo/blob/main/packages/js-on-device-eval-client/src/Evaluator.ts#L427-L433
PR to do the same to the node-js-server-sdk statsig-io/node-js-server-sdk#51