graphql-ruby 1.9.8 resolver arguments don't work when schema is built from_definition

graphql-from-definition-args.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# This illustrates a bug in graphql-ruby 1.9.8.  Prior to this version,
# a resolver function passed in the map to GraphQL::Schema.from_definition
# could access its arguments as methods on the `args` object it gets passed;
# but starting in graphql-ruby 1.9.8 this no longer works.

require 'graphql'

# This is a sample very small GraphQL schema.
SDL = <<~GRAPHQL
  input In { s: String! }
  type Query {
    echo(in: In!): String!
  }
GRAPHQL

RESOLVERS = {
  'Query' => {
    # vvv THIS LINE is what breaks
    'echo' => ->(_obj, args, _ctx) { args.in.s }
    # ^^^
    #
    # In graphql-ruby 1.9.7, args.in.s resolves to the passed-in
    # argument.  In graphql-ruby 1.9.8, it produces a NoMethodError
    # where args.in isn't defined.
  }.freeze
}.freeze

# Create the GraphQL schema object
Schema = GraphQL::Schema.from_definition(SDL, default_resolve: RESOLVERS)

# Run a minimal query
QUERY = '{ echo(in: { s: "foo" }) }'
result = Schema.execute(QUERY)
p result