Fixes #125.

Note that testing PHP errors relies on PHP's `error_reporting` runtime configuration.
Fixes #119 (via @Moosh-be).

Fugbix typo.
Fixes #129.

Distilled down convoluted `getReverseIterator()` description.
tidy does not work on HTML5
[ja] Sync with 20010189a878c2392938bda7aff4360a31be0793

Note that testing PHP errors relies on PHP's `error_reporting` runtime configuration.
[ja] Sync with 1ea734350a3ed12b99f818b807c734b334f7ab94

Distilled down convoluted `getReverseIterator()` description.