Take a copy of any options hash if we're modifying it.

This will not give the caller a surprise if they are using the hash themselves and saves them having to have the knowledge that some calls modify it.

lib/twitter/rest/direct_messages.rb

@@ -58,6 +58,7 @@ def direct_messages_sent(options = {})
       # @param options [Hash] A customizable set of options.
       # @option options [Boolean] :full_text Returns the full text of a DM when message text is longer than 140 characters.
       def direct_message(id, options = {})
+        options = options.dup
         options[:id] = id
         perform_get_with_object('/1.1/direct_messages/show.json', options, Twitter::DirectMessage)
       end
@@ -126,6 +127,7 @@ def destroy_direct_message(*args)
       # @param text [String] The text of your direct message, up to 10,000 characters.
       # @param options [Hash] A customizable set of options.
       def create_direct_message(user, text, options = {})
+        options = options.dup
         merge_user!(options, user)
         options[:text] = text
         perform_post_with_object('/1.1/direct_messages/new.json', options, Twitter::DirectMessage)

lib/twitter/rest/friends_and_followers.rb

@@ -180,6 +180,7 @@ def friendship_update(user, options = {})
       # @param target [Integer, String, Twitter::User] The Twitter user ID, screen name, or object of the target user.
       # @param options [Hash] A customizable set of options.
       def friendship(source, target, options = {})
+        options = options.dup
         merge_user!(options, source, 'source')
         options[:source_id] = options.delete(:source_user_id) unless options[:source_user_id].nil?
         merge_user!(options, target, 'target')

lib/twitter/rest/oauth.rb

@@ -22,6 +22,7 @@ module OAuth
       #   client = Twitter::REST::Client.new(consumer_key: 'abc', consumer_secret: 'def')
       #   bearer_token = client.token
       def token(options = {})
+        options = options.dup
         options[:bearer_token_request] = true
         options[:grant_type] ||= 'client_credentials'
         url = 'https://api.twitter.com/oauth2/token'
@@ -41,6 +42,7 @@ def token(options = {})
       # @param options [Hash] A customizable set of options.
       # @return [String] The invalidated token. token_type should be nil.
       def invalidate_token(access_token, options = {})
+        options = options.dup
         options[:access_token] = access_token
         perform_post('/oauth2/invalidate_token', options)[:access_token]
       end

lib/twitter/rest/search.rb

@@ -26,6 +26,7 @@ module Search
       # @option options [Integer] :max_id Returns results with an ID less than (that is, older than) or equal to the specified ID.
       # @return [Twitter::SearchResults] Return tweets that match a specified query with search metadata
       def search(q, options = {})
+        options = options.dup
         options[:count] ||= MAX_TWEETS_PER_REQUEST
         request = Twitter::REST::Request.new(self, :get, '/1.1/search/tweets.json', options.merge(q: q))
         Twitter::SearchResults.new(request)

lib/twitter/rest/trends.rb

@@ -19,6 +19,7 @@ module Trends
       # @option options [String] :exclude Setting this equal to 'hashtags' will remove all hashtags from the trends list.
       # @return [Array<Twitter::Trend>]
       def trends(id = 1, options = {})
+        options = options.dup
         options[:id] = id
         response = perform_get('/1.1/trends/place.json', options).first
         Twitter::TrendResults.new(response)

lib/twitter/rest/tweets.rb

@@ -41,6 +41,7 @@ def retweets(tweet, options = {})
       # @option options [Boolean, String, Integer] :trim_user Each tweet returned in a timeline will include a user object with only the author's numerical ID when set to true, 't' or 1.
       # @option options [Boolean] :ids_only ('false') Only return user IDs instead of full user objects.
       def retweeters_of(tweet, options = {})
+        options = options.dup
         ids_only = !!options.delete(:ids_only)
         retweeters = retweets(tweet, options).collect(&:user)
         ids_only ? retweeters.collect(&:id) : retweeters
@@ -221,6 +222,7 @@ def retweet!(*args)
       # @option options [String] :display_coordinates Whether or not to put a pin on the exact coordinates a tweet has been sent from.
       # @option options [Boolean, String, Integer] :trim_user Each tweet returned in a timeline will include a user object with only the author's numerical ID when set to true, 't' or 1.
       def update_with_media(status, media, options = {})
+        options = options.dup
         media_ids = pmap(array_wrap(media)) do |medium|
           upload(medium)[:media_id]
         end
@@ -246,6 +248,7 @@ def update_with_media(status, media, options = {})
       # @option options [String] :widget_type Set to video to return a Twitter Video embed for the given Tweet.
       # @option options [Boolean, String] :hide_tweet Applies to video type only. Set to 1 or true to link directly to the Tweet URL instead of displaying a Tweet overlay when a viewer clicks on the Twitter bird logo.
       def oembed(tweet, options = {})
+        options = options.dup
         options[:id] = extract_id(tweet)
         perform_get_with_object('/1.1/statuses/oembed.json', options, Twitter::OEmbed)
       end

lib/twitter/rest/users.rb

@@ -246,6 +246,7 @@ def user(*args)
       # @return [Boolean] true if the user exists, otherwise false.
       # @param user [Integer, String, Twitter::User] A Twitter user ID, screen name, URI, or object.
       def user?(user, options = {})
+        options = options.dup
         merge_user!(options, user)
         perform_get('/1.1/users/show.json', options)
         true
@@ -265,6 +266,7 @@ def user?(user, options = {})
       # @option options [Integer] :count The number of people to retrieve. Maxiumum of 20 allowed per page.
       # @option options [Integer] :page Specifies the page of results to retrieve.
       def user_search(query, options = {})
+        options = options.dup
         perform_get_with_objects('/1.1/users/search.json', options.merge(q: query), Twitter::User)
       end