| ⇢ | A | Reader added |
| ⇢ | B | Reader::readAhead() added | |
| ⇢ | B | Reader::nextToken() added | |
| ⇢ | A | Reader::__construct() added | |
| ⇢ | A | Reader::read() added | |
| ⇢ | A | Reader::guardAgainstUnexpectedEof() added | |
| ⇢ | A | Reader::guardAgainstInvalidExpression() added | |
| B | ↛ | parse() removed | |
| A | ↛ | tokenize() removed |