coerce :hooks (as a Hash) to Pry::Hooks instance in Pry.start().

lib/pry/hooks.rb

@@ -18,6 +18,7 @@ class Pry
     # @param [Hash] hash The hash to convert to `Pry::Hooks`.
     # @return [Pry::Hooks] The resulting `Pry::Hooks` instance.
     def self.from_hash(hash)
+      return hash if hash.instance_of?(self)
       instance = new
       hash.each do |k, v|
         instance.add_hook(k, nil, v)

lib/pry/pry_class.rb

@@ -119,7 +119,7 @@ class Pry
     end
 
     options[:target] = Pry.binding_for(target || toplevel_binding)
-
+    options[:hooks] = Pry::Hooks.from_hash options.delete(:hooks) if options.key?(:hooks)
     initial_session_setup
 
     # Unless we were given a backtrace, save the current one

lib/pry/pry_instance.rb

@@ -68,7 +68,7 @@ class Pry
     @eval_string   = ""
     @backtrace     = options[:backtrace] || caller
     @config = Pry::Config.new
-    @config.merge!(options)
+    config.merge!(options)
     push_prompt(config.prompt)
     @input_array  = Pry::HistoryArray.new config.memory_size
     @output_array = Pry::HistoryArray.new config.memory_size