servername_cb (and others) do odd things with lambda/proc?

Might be related to https://bugs.ruby-lang.org/issues/12705

When I do something like this:

server_context = OpenSSL::SSL::SSLContext.new.tap do |context|
	context.servername_cb = proc {|socket, name|
		if hosts.include? name
			OpenSSL::SSL::SSLContext.new.tap do |context|
				context.cert = certificates[name]
				context.key = keys[name]
			end
		end
	}
end

it works. But if I change proc to lambda, it fails with ArgumentError: wrong number of arguments (given 1, expected 2).

server_context = OpenSSL::SSL::SSLContext.new.tap do |context|
	context.servername_cb = lambda {|socket, name|
		if hosts.include? name
			OpenSSL::SSL::SSLContext.new.tap do |context|
				context.cert = certificates[name]
				context.key = keys[name]
			end
		end
	}
end

However, I feel like both should work. Does proc unwrap array implicitly?

Start by reproducing the two callback forms through OpenSSL::SSL::SSLContext#servername_cb, comparing how the proc and lambda receive socket and name. Read the callback behavior around SSLContext.new and servername_cb, then confirm that the corrected behavior handles both forms with the expected arguments.