Pass strings through wildcard key redaction (#32)

Per #31, we currently throw a `TypeError` when we try to apply a
wildcard key redaction configuration to a string target. Strings spoofed
themselves into an object code path due to gotchas like:

```js
Object.keys('string')
// => [ '0', '1', '2', '3', '4', '5' ]
```

We already bail early on nullish targets, so we can extend this
behaviour to cover string targets as well. Other primitives are already
handled safely but I've added tests to cover them off.

lib/modifiers.js

@@ -8,7 +8,7 @@ module.exports = {
 }
 
 function groupRestore ({ keys, values, target }) {
-  if (target == null) return
+  if (target == null || typeof target === 'string') return
   const length = keys.length
   for (var i = 0; i < length; i++) {
     const k = keys[i]
@@ -18,7 +18,7 @@ function groupRestore ({ keys, values, target }) {
 
 function groupRedact (o, path, censor, isCensorFct, censorFctTakesPath) {
   const target = get(o, path)
-  if (target == null) return { keys: null, values: null, target: null, flat: true }
+  if (target == null || typeof target === 'string') return { keys: null, values: null, target, flat: true }
   const keys = Object.keys(target)
   const keysLength = keys.length
   const pathLength = path.length

test/index.js

@@ -89,6 +89,35 @@ test('returns original value when passed non-object using [strict: false, serial
   end()
 })
 
+test('returns original value when passed non-object at wildcard key', ({ end, doesNotThrow, strictSame }) => {
+  const redactSerializeFalse = fastRedact({
+    paths: ['a.*'],
+    strict: false,
+    serialize: false
+  })
+
+  const primitives = [null, undefined, 'A', 1, false]
+
+  primitives.forEach((a) => {
+    doesNotThrow(() => redactSerializeFalse({ a }))
+    const res = redactSerializeFalse({ a })
+    strictSame(res, { a })
+  })
+
+  end()
+})
+
+test('returns censored values when passed array at wildcard key', ({ end, strictSame }) => {
+  const redactSerializeFalse = fastRedact({
+    paths: ['a.*'],
+    strict: false,
+    serialize: false
+  })
+  const res = redactSerializeFalse({ a: ['redact', 'me'] })
+  strictSame(res.a, [censor, censor])
+  end()
+})
+
 test('throws if a path is not a string', ({ end, throws }) => {
   const invalidTypeMsg = 'fast-redact - Paths must be (non-empty) strings'
   throws((e) => {