https://github.com/google/guava/blob/7155d12b70a2406fa84d94d4b8b3bc108e89abfd/guava/src/com/google/common/escape/ArrayBasedUnicodeEscaper.java#L161-L173
https://github.com/google/guava/blob/7155d12b70a2406fa84d94d4b8b3bc108e89abfd/guava/src/com/google/common/escape/ArrayBasedUnicodeEscaper.java#L176-L188
