//! FFI API for physics FDM (Finite Difference Method) functions.
//!
//! This module provides three types of FFI interfaces:
//! - Handle-based API (C-style functions)
//! - JSON-based API (string serialization)
//! - Bincode-based API (binary serialization)
/// bincode-based FFI bindings for physics FDM functions.
/// Handle-based FFI bindings for physics FDM using opaque handles.
/// JSON-based FFI bindings for physics FDM using serialized data.