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diff --git a/node_modules/uncss/node_modules/form-data/node_modules/lodash/_toKey.js b/node_modules/uncss/node_modules/form-data/node_modules/lodash/_toKey.js
new file mode 100644
index 000000000..c6d645c4d
--- /dev/null
+++ b/node_modules/uncss/node_modules/form-data/node_modules/lodash/_toKey.js
@@ -0,0 +1,21 @@
+var isSymbol = require('./isSymbol');
+
+/** Used as references for various `Number` constants. */
+var INFINITY = 1 / 0;
+
+/**
+ * Converts `value` to a string key if it's not a string or symbol.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {string|symbol} Returns the key.
+ */
+function toKey(value) {
+  if (typeof value == 'string' || isSymbol(value)) {
+    return value;
+  }
+  var result = (value + '');
+  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+}
+
+module.exports = toKey;