The method signature format has been changed from space-counted arity (e.g., "== ") to explicit parenthesized parameter lists (e.g., "==(_)"). This required updating the MAX_METHOD_SIGNATURE calculation to account for parentheses and parameter separators, replacing the old copyName helper with a new Signature struct and SignatureType enum, and rewriting the methodNotFound error message to display the full signature string instead of reconstructing arity from trailing spaces. All core method registrations in wren_core.c, wren_io.c, and corresponding test expectations have been updated to use the new signature format.
The wrenDefineMethod and wrenDefineStaticMethod functions now accept a single `signature` string parameter instead of separate `methodName` and `arity` arguments. This simplifies the API by letting callers specify the full method signature (including arity spaces) directly, removing the internal arity-to-spaces conversion logic in defineMethod. The change updates the header declaration, the internal defineMethod helper, and all call sites in wren_io.c to pass pre-formatted signatures.
Add string type check for IO.read() prompt argument with Fiber.abort on non-string input. Implement stdin piping in test runner via // stdin: comments, allowing tests to provide input lines. Update stack trace filtering to omit built-in library frames with empty source paths. Add io/read.wren and io/read_arg_not_string.wren test cases.
Implement a new static `IO.read(prompt)` method in the IO class that writes a prompt string to stdout and reads a line from stdin into a fixed 1024-byte buffer. The C implementation adds a `MAX_READ_LEN` constant, an `ioRead` function using `fgets`, and registers the method via `wrenDefineStaticMethod`. The builtin source string is updated to include the new Wren method definition.
Add writeObject_ helper that checks if obj.toString returns a String before
writing it, falling back to "[invalid toString]" otherwise. Update print,
write, and printList_ to use the new helper instead of calling toString
directly. Include test cases for both IO.print and IO.write with a class
whose toString returns an integer.
Add static `IO.read(prompt)` method to the IO class that writes the prompt to stdout
and reads a line from stdin into a 1024-byte buffer. The C implementation uses
`fgets` for input and returns the string via `wrenReturnString`. The Wren wrapper
calls `IO.write` for the prompt before delegating to the native `IO.read` method.
Add a static `print` method with no arguments that writes only a newline, enabling blank-line output. Remove the `ignoreNewlines` calls before closing parentheses in parameter lists and method calls, tightening syntax rules. Add a `strlen` TODO comment in symbol table lookup for future optimization. Move the `Foo.toString` test from `test/io/write.wren` to `test/io/print.wren` and delete the old write test file.
Add 15 static overloads of IO.print in builtin/io.wren and src/wren_io.c, each delegating to a new private printList_ method that iterates over a list of objects. Update all benchmark and test files to use the new multi-argument syntax, removing explicit .toString calls and string concatenation. Add a comprehensive test/io/print.wren verifying single-argument return value, multi-argument null return, and concatenation of up to 16 arguments.
Rename boolean defines from `true`/`false` to `1`/`0` for consistency, prefix debug flags with `WREN_DEBUG_`, add `WREN_USE_LIB_IO` flag to guard IO library loading, and wrap IO module includes and function declarations in conditional compilation blocks.
Migrate the clock timing functionality from the OS class to the IO class across all benchmark scripts and the core library. Remove the os_clock native function and its associated OS class definition from wren_core.c, while adding a new ioClock native in wren_io.c that uses the same clock()/CLOCKS_PER_SEC logic. Update all benchmark files (binary_trees, fib, for, method_call) to reference IO.clock instead of OS.clock for both start time and elapsed time calculations.
Replace monolithic corelib.wren with per-class builtin/*.wren files and generate_builtins.py script. Move IO class definition and its native writeString_ method from wren_core.c to new wren_io.c, adding wrenGetArgumentString and wrenDefineStaticMethod to the public API. Update Makefile target from corelib to builtin and remove generate_corelib.py.
