Issue #3101247 by mondrake, longwave, Saurabh_sgh, alexpott, jhedstrom, xjm: Deprecate AssertHelperTrait::castSafeStrings() in favour of MarkupInterfaceComparator

Issue #2898947 by rajandro, jungle, ankit.singh, AkashkumarOSL, Lal_, shimpy, Saurabh_sgh, markdorison, gnikolovski, jordanwood, librarylasso, Swapnil_Kotwal, mrinalini9, chiranjeeb2410, codersukanta, daffie, xjm, alexpott, mmjvb, mparker17, MaskyS, larowlan, quietone: Change "writeable" to "writable" in documentation

Issue #2673688 by himanshu_sindhwani, kkalashnikov, atul4drupal, Saurabh_sgh, walangitan, andypost, markdorison, Bunty Badgujar, xjm, catch: Remove remains of hook_field_schema()