Add INFIX_OPERATOR entries for TOKEN_PIPE and TOKEN_AMP with PREC_BITWISE precedence in the compiler's grammar rules, replacing the previous UNUSED entries. This allows user-defined classes to implement custom `|` and `&` operator methods.
Include a new test file `test/custom_operators/bitwise.wren` that defines Amp and Pipe classes with their respective operator methods to validate the feature works correctly.
Fix two typos in doc/site/performance.markdown: change "rivalling" to "rivaling" in the paragraph about language implementation complexity, and change "carvinal" to "carnival" in the benchmarks section.
Implement a `where` method on the List class that takes a predicate function and returns a new list containing only elements for which the predicate returns true. The implementation iterates over the list, calls the predicate on each element, and collects matching elements into a new list. Includes test cases verifying filtering with both matching and non-matching predicates.
Implement a `map` method on the List class that applies a given function `f` to each element, returning a new list with the transformed values. Includes a test case verifying incrementing each element by 1.
Add `+` method to List class in core.wren that creates a new list by concatenating elements from both operands. Supports concatenation with Range objects and handles empty lists on either side. Includes comprehensive test cases in test/list/concat.wren covering list-list, list-range, and empty list combinations.
Kyle Marek-Spartz