# debug ### stack_depth() function Return the current stack depth. **Returns**: A number representing the stack depth. ### build_backtrace() function Build and return a backtrace of the current call stack. **Returns**: An object representing the call stack backtrace. ### closure_vars(fn) function Return the closure variables for a given function. **fn**: The function object to inspect. **Returns**: An object containing the closure variables. ### local_vars(depth) function Return the local variables for a specific stack frame. **depth**: The stack frame depth to inspect. **Returns**: An object containing the local variables at the specified depth. ### fn_info(fn) function Return metadata about a given function. **fn**: The function object to inspect. **Returns**: An object with metadata about the function. ### backtrace_fns() function Return an array of functions in the current backtrace. **Returns**: An array of function objects from the call stack. ### dump_obj(obj) function Return a string representation of a given object. **obj**: The object to dump. **Returns**: A string describing the object's contents.