Function isFormat

Returns meta is
    | Extract<
        { class: 32
        | 64; endian: "le" | "be"; format: "ELF" },
        { format: F },
    >
    | Extract<{ format: "PE"; peType: "PE32" | "PE32+" }, { format: F }>
    | Extract<{ cpuType: string; format: "MACHO" }, { format: F }>
    | Extract<{ format: "PDF"; version: string }, { format: F }>
    | Extract<{ format: "PNG"; height: number; width: number }, { format: F }>
    | Extract<{ format: "JPEG"; height: number; width: number }, { format: F }>
    | Extract<{ entries: number; format: "ZIP" }, { format: F }>
    | Extract<{ entropy: number; format: "BIN" }, { format: F }>

True if meta matches the expected format.