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## Upgrading to v5
- Names involving `a, b`, `from, to`, `base, changed` have been renamed to `old, new` for consistency.
Here's some examples:
- `Diff::setAB()` becomes `Diff::setOldNew()`.
- `Diff::setA()` becomes `Diff::setOld()`.
- `Diff::setB()` becomes `Diff::setNew()`.
- `Diff::getA()` becomes `Diff::getOld()`.
- `Diff::getB()` becomes `Diff::getNew()`.
- `base`, `changed` keys in the result of the `Json` renderer have become `old`, `new`.
- In the result of HTML renderers, classes of rows of line numbers has been changed.
You may have to change your CSS if you have some customized things depend on these.
- `<th class="f-num">` (from-number) becomes `<th class="n-new">` (number-new).
- `<th class="t-num">` (to-number) becomes `<th class="n-old">` (number-old).
- The `tag` (sometimes called `op`) in `Json` template is now in `int` form by default.
To get previous behavior, set the renderer option `outputTagAsString` to `true`.
- The `tag` (sometimes called `op`) in `Diff::getGroupedOpcodes()`'s results are now in `int` form.
The corresponding meaning could be found in
[jfcherng/php-sequence-matcher](https://github.com/jfcherng/php-sequence-matcher/blob/3.0.0/src/SequenceMatcher.php#L16-L26).
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