Use null prototype for userProperties #88
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It is a good security practice to set the prototype to null to avoid adding methods such as hasOwnProperties that users could actually call. Calling those methods directly might lead to a crash or an error. See: https://github.com/nodejs/node/blob/e1edd6bbfab32bf95ee33532f1d4faaeafceb13c/lib/querystring.js#L262
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It is a good security practice to set the prototype to null to avoid
adding methods such as hasOwnProperties that users could actually call.
Calling those methods directly might lead to a crash or an error.
See: https://github.com/nodejs/node/blob/e1edd6bbfab32bf95ee33532f1d4faaeafceb13c/lib/querystring.js#L262