Use casecmp?() instead of casecmp().zero?

app/controllers/application_controller.rb

@@ -181,7 +181,7 @@ class ApplicationController < ActionController::Base
     # TODO: some sort of escaping of problem characters in the message
     response.headers["Error"] = message
 
-    if request.headers["X-Error-Format"]&.casecmp("xml")&.zero?
+    if request.headers["X-Error-Format"]&.casecmp?("xml")
       result = OSM::API.new.xml_doc
       result.root.name = "osmError"
       result.root << (XML::Node.new("status") << "#{Rack::Utils.status_code(status)} #{Rack::Utils::HTTP_STATUS_CODES[status]}")

app/controllers/geocoder_controller.rb

@@ -225,12 +225,12 @@ class GeocoderController < ApplicationController
   end
 
   def to_decdeg(captures)
-    ns = captures.fetch("ns").casecmp("s").zero? ? -1 : 1
+    ns = captures.fetch("ns").casecmp?("s") ? -1 : 1
     nsd = BigDecimal(captures.fetch("nsd", "0"))
     nsm = BigDecimal(captures.fetch("nsm", "0"))
     nss = BigDecimal(captures.fetch("nss", "0"))
 
-    ew = captures.fetch("ew").casecmp("w").zero? ? -1 : 1
+    ew = captures.fetch("ew").casecmp?("w") ? -1 : 1
     ewd = BigDecimal(captures.fetch("ewd", "0"))
     ewm = BigDecimal(captures.fetch("ewm", "0"))
     ews = BigDecimal(captures.fetch("ews", "0"))

app/models/request_token.rb

@@ -73,7 +73,7 @@ class RequestToken < OauthToken
   end
 
   def oob?
-    callback_url.nil? || callback_url.casecmp("oob").zero?
+    callback_url.nil? || callback_url.casecmp?("oob")
   end
 
   def oauth10?