Don't treat a non-null input type field changing to nullable input type field as a breaking change about graphql-schema_comparator HOT 2 CLOSED

old_schema_idl = <<~SCHEMA
  schema {
    query: Query
  }
  input Foo {
    bar: String!
  }
  type Query {
    a(foo: Foo!): String!
  }
SCHEMA

new_schema_idl = <<~SCHEMA
  schema {
    query: Query
  }
  input Foo {
    bar: String
  }
  type Query {
    a(foo: Foo!): String!
  }
SCHEMA

result = GraphQL::SchemaComparator.compare(old_schema_idl, new_schema_idl)

assert_equal ["Input field `Foo.bar` changed type from `String!` to `String`"], 
                       result.changes.map(&:message)

refute result.breaking?