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refers to incompatibilities with Regexp.union()

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Original file line number	Diff line number	Diff line change
`@@ -34,9 +34,13 @@ Add this line to your application's Gemfile:`
`34`	`34`	`gem 'regexp_trie'`
`35`	`35`	```
`36`	`36`
`37`		`-## Known Issues`
	`37`	+## Incompatibilities with the built-in `Regexp.union()`
`38`	`38`
`39`		-This is not perfectly compatible with `Regexp.union()`.
	`39`	+* `RegexpTrie` handles only literals. i.e. `RegexpTrie.union("foo.bar")` produces `/foo\.\bar/`, not `/foo.*bar/`
	`40`	+* `RegexpTrie` cannot handle empty strings.
	`41`	`+* The order of words does not matter:`
	`42`	+ * `Regexp.union("foo", "foobar").match("foobar") # => #<MatchData "foo">`
	`43`	+ * `RegexpTrie.union("foo", "foobar").match("foobar") # => #<MatchData "foobar">`
`40`	`44`
`41`	`45`	`## Development`
`42`	`46`

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