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1 | /**
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2 | * Checks if `value` is suitable for use as unique object key.
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3 | *
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4 | * @private
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5 | * @param {*} value The value to check.
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6 | * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
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7 | */
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8 | function isKeyable(value) {
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9 | var type = typeof value;
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10 | return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
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11 | ? (value !== '__proto__')
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12 | : (value === null);
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13 | }
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14 |
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15 | module.exports = isKeyable;
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