Checking equality when we delete

Dependencies

• [2] DASFQGOR Debugging
• [3] WS4ZQM4R Debugging, tests, etc.
• [4] OFINGD26 implementing prev() on cursors (+ some cleanup)
• [5] HN6Z5DU4 Cleanup
• [6] OTWDDJE7 Trait/type cleanup
• [7] QYDGYIZR Split trait Representable into its mandatory part and an optional part
• [8] UUUVNC4D Debugging/cleanup around cursors
• [9] TSMS6W4D Fully commented implementation of Sized nodes + massive cleanup
• [10] OP6SVMOD Resetting history

Change contents

• replacement in sanakirja-core/src/btree/del.rs at line 81
  [2.6638]→[3.11745:11790](∅→∅),[3.11745]→[3.11745:11790](∅→∅)
  − V: Storable + ?Sized + core::fmt::Debug,
  [2.6638]

  [3.15929]
  + V: Storable + ?Sized + core::fmt::Debug + PartialEq,
• replacement in sanakirja-core/src/btree/del.rs at line 90
  [3.9635]→[3.37282:37330](∅→∅),[3.37330]→[3.7504:7559](∅→∅),[3.7504]→[3.7504:7559](∅→∅),[3.385]→[3.53628:53654](∅→∅),[3.7559]→[3.53628:53654](∅→∅),[3.53628]→[3.53628:53654](∅→∅)
  − if cursor.set(txn, key, value)?.is_none() {

  − // If the key and value weren't found, return.

  − return Ok(false);
  [3.9635]

  [3.53654]
  + // If the key and value weren't found, return.

  + match (cursor.set(txn, key, value)?, value) {

  + (Some((k, v)), Some(value)) if k == key && v == value => {}

  + (Some((k, _)), None) if k == key => {}

  + _ => return Ok(false),