ValueLayoutAttribute

// `[ValueLayout(Layout.Explicit, Size = 128)]`, `[ValueLayout(Layout.Sequential, Pack = 1)]` on a `value`: its
// fields where C would put them, for structs and unions that cross to C by pointer. The fields hold numbers, bools,
// pointers, `func*`, inline arrays and other such values (no objects); reading or writing one is unsafe memory
// access, so the value is meant for interop.
public class System.Runtime.InteropServices.ValueLayoutAttribute : System.Attribute
{
    // Sequential or explicit.
    field Kind: System.Runtime.InteropServices.Layout
    // The largest alignment a field gets (1, 2, 4, 8 or 16; 0: each field's own).
    field Pack: i32
    // The value's size in bytes when it must be larger than its fields (0: what the fields need).
    field Size: i32
    constructor ValueLayoutAttribute(kind: System.Runtime.InteropServices.Layout)
}