Add toSafeInteger

snippets/toSafeInteger.md

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+### toSafeInteger
+
+Converts a value to a safe integer.
+
+Use `Math.max()` and `Math.min()` to find the closest safe value.
+Use `Math.round()` to convert to an integer.
+
+```js
+const toSafeInteger = num =>
+  Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));
+```
+
+```js
+toSafeInteger('3.2'); // 3
+toSafeInteger(Infinity); // 9007199254740991
+```