Begin requirements section (#621)

binaryseed · IvanGoncharov · commit 849d12407350 · 2019-10-01T13:40:53.000+03:00
diff --git a/rfcs/InputUnion.md b/rfcs/InputUnion.md
@@ -123,7 +123,7 @@ mutation {
       {name: "Buster", age: 3, livesLeft: 7},
 
       # This is meant to be a DogInput
-      {name: "Ripple", age: 2},
+      {name: "Ripple", age: 2}
     ]
   )
 }
@@ -133,6 +133,10 @@ In this mutation, we encounter the main challenge of the **Input Union** - we ne
 
 A wide variety of solutions have been explored by the community, and they are outlined in detail in this document under [Possible Solutions](#Possible-Solutions).
 
+## Requirements
+
+1. **Backwards compatible** Adding a new member type to an Input Union must not break previously valid operations
+
 ## Use Cases
 
 TODO:

Original file line number	Diff line number	Diff line change
`@@ -123,7 +123,7 @@ mutation {`
`123`	`123`	`{name: "Buster", age: 3, livesLeft: 7},`
`124`	`124`
`125`	`125`	`# This is meant to be a DogInput`
`126`		`- {name: "Ripple", age: 2},`
	`126`	`+ {name: "Ripple", age: 2}`
`127`	`127`	`]`
`128`	`128`	`)`
`129`	`129`	`}`
`@@ -133,6 +133,10 @@ In this mutation, we encounter the main challenge of the Input Union - we ne`
`133`	`133`
`134`	`134`	`A wide variety of solutions have been explored by the community, and they are outlined in detail in this document under [Possible Solutions](#Possible-Solutions).`
`135`	`135`
	`136`	`+## Requirements`
	`137`	`+`
	`138`	`+1. Backwards compatible Adding a new member type to an Input Union must not break previously valid operations`
	`139`	`+`
`136`	`140`	`## Use Cases`
`137`	`141`
`138`	`142`	`TODO:`