/**
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								 * Checks if a stack value for `key` exists.
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								 *
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								 * @private
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								 * @name has
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								 * @memberOf Stack
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								 * @param {string} key The key of the entry to check.
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								 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
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								 */
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								function stackHas(key) {
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								  return this.__data__.has(key);
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								}
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								module.exports = stackHas;
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