fix: added a symbol to detect non passed props with Vue 3.1.x - #3295
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As reported in #3294 the new behavior of prop keys always present causes issues with checkboxes and initial value detection, this is caused by the reliance on detecting if a user didn't pass a
model-valueprop.This PR mitigates this by introducing a unique symbol value as a default to deter when the user didn't pass a model value.