Implement six new trimming methods on String: trim(), trim(chars), trimEnd(), trimEnd(chars), trimStart(), trimStart(chars). The core logic uses a private trim_ helper that accepts a chars string, converts it to code points, and iterates from the start and/or end of the string to remove matching characters. Default whitespace set is tab, carriage return, newline, and space. Includes comprehensive test coverage for default and custom character trimming, edge cases (empty strings, all-trimmed strings, 8-bit clean data), and runtime error when chars argument is not a string.
Add type and range checks to Sequence.skip() and Sequence.take() methods, aborting with "Count must be a non-negative integer." when count is not a non-negative integer. Rename split() parameter from 'delim' to 'delimiter' and update its error message from "Argument must be a non-empty string." to "Delimiter must be a non-empty string." for consistency. Remove old behavior allowing negative counts and add new test files for skip/take validation errors.
Implement `skip(count)` and `take(count)` on the Sequence class, backed by new SkipSequence and TakeSequence wrapper classes that lazily skip or limit iteration. Includes documentation in the sequence module markdown, core source definitions, and unit tests for edge cases (zero, negative, and overflow counts).
Add MapEntry class to expose key-value pairs during map iteration, and make Map extend Sequence so maps can be directly iterated with `for` loops. Rename the internal `iterate_` primitive to `iterate` and update error messages for invalid map iterators.
Add `*(count)` method to both String and List classes in wren_core.wren, enabling eager repetition of string characters or list elements. The operator validates that count is a non-negative integer, aborting with a clear error message otherwise. For strings, concatenates the original string count times; for lists, builds a new list by adding all elements count times. Includes comprehensive test cases for normal, zero, and edge-case inputs, plus error tests for negative, non-integer, and non-numeric counts. Also refactors existing list plus tests to use inline expressions and adds a plus_not_iterable error test.
Remove the deferred function compilation for interpolation parts and instead evaluate them directly during string parsing. This simplifies the compiler by eliminating the need for String.interpolate_() and the associated closure creation, replacing it with a direct list construction and join() call.
Add lexer support for `TOKEN_INTERPOLATION` to split string literals at interpolation points, introduce `MAX_INTERPOLATION_NESTING` limit of 8, and compile interpolated strings by emitting calls to `String.interpolate_()`. Optimize list and map literal construction with new `addCore_` primitives to reduce stack churn. Update `String`, `List`, and `Map` `toString` methods in core library to use interpolation syntax, and migrate all benchmark and test files from explicit concatenation to interpolated strings.
- Remove builtin/README.md explaining the .wren to .wren.inc conversion process
- Update src/README.md to document new aux/ directory for optional modules
- Fix generated file headers in wren_core.wren.inc and wren_aux_random.wren.inc to point to new source locations
- Update Makefile pattern rule to look for .wren sources in src/vm/ instead of builtin/
- Adjust wren_to_c_string.py to strip both "aux_" and "wren_" prefixes when deriving module names
Implement SkipSequence and TakeSequence as lazy iterator-producing wrappers in the core Sequence class. SkipSequence advances past the first count elements on initial iteration, while TakeSequence tracks taken count via _taken field and returns null when exceeded. Include documentation in sequence.markdown, update wren_core.wren.inc, and add test files for both methods covering edge cases (zero, negative, overflow counts).
