An enum TileUsageFlags in the Saandy.Tilemapper namespace that defines bitflags for tile usage: None, Render (bit 0), Collision (bit 1), and Solid as combination of Render and Collision.
using System;
namespace Saandy.Tilemapper;
[Flags]
public enum TileUsageFlags
{
None = 0,
Render = 1 << 0,
Collision = 1 << 1,
Solid = Render | Collision
}