040000 tree 272a6f393fa7aae6ae1eb5e5ad03ec099bd5e7be	csharp
100644 blob 0491b820d6fd5e0cf521b34baab83d1798459403	field_presence.md
100644 blob 585b7a2a93740c87d89f8ff98d7e5551b54d86a3	implementing_proto3_presence.md
100644 blob df6b88c033f78662a5b313668fd53299ad551388	options.md
100644 blob 8734c700c129e98f15e92c5a306fbee57ae94cb2	performance.md
100644 blob 11a6efb5b160a579162c039284ee9c1963163580	third_party.md