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var Buffer = require('buffer').Buffer; // for use with browserify
module.exports = function (a, b) {
if (!Buffer.isBuffer(a)) return undefined;
if (!Buffer.isBuffer(b)) return undefined;
if (typeof a.equals === 'function') return a.equals(b);
if (a.length !== b.length) return false;
for (var i = 0; i < a.length; i++) {
if (a[i] !== b[i]) return false;
}
return true;
};