Serialization

The C ABI implements the first binary fitted-model format behind:

• n4m_model_export_size

• n4m_model_export_to_buffer

• n4m_model_import_from_buffer

• n4m_serialization_inspect

The format is little-endian and starts with:

magic[4] = "P4AM"
u32 format_version = 1
u32 writer_abi_major
u32 writer_abi_minor
u32 writer_abi_patch

The payload stores model metadata, preprocessing statistics, coefficients, latent matrices and optional training scores. A trailing FNV-1a 64-bit checksum covers every byte before the checksum field. Imports reject bad magic, truncated payloads, impossible dimensions, length mismatches and checksum failures with N4M_ERR_CORRUPT_BUFFER; unsupported format versions return N4M_ERR_VERSION_INCOMPATIBLE.