diff --git a/lib/sassc/embedded.rb b/lib/sassc/embedded.rb
index 45f1479..f89d7c4 100644
--- a/lib/sassc/embedded.rb
+++ b/lib/sassc/embedded.rb
@@ -139,8 +139,6 @@ class FunctionsHandler
     remove_method(:setup) if public_method_defined?(:setup, false)
 
     def setup(_native_options, functions: Script::Functions)
-      @callbacks = {}
-
       functions_wrapper = Class.new do
         attr_accessor :options
 
@@ -148,7 +146,7 @@ def setup(_native_options, functions: Script::Functions)
       end.new
       functions_wrapper.options = @options
 
-      Script.custom_functions(functions:).each do |custom_function|
+      Script.custom_functions(functions:).map.with_object({}) do |custom_function, callbacks|
         callback = lambda do |native_argument_list|
           function_arguments = arguments_from_native_list(native_argument_list)
           begin
@@ -162,10 +160,8 @@ def setup(_native_options, functions: Script::Functions)
           raise e
         end
 
-        @callbacks[Script.formatted_function_name(custom_function, functions:)] = callback
+        callbacks[Script.formatted_function_name(custom_function, functions:)] = callback
       end
-
-      @callbacks
     end
 
     private
@@ -375,8 +371,7 @@ def import_to_native(import, parent_dir, from_import, canonicalize)
           canonical_url = Uri.path_to_file_url(File.absolute_path(import.path, parent_dir))
           @importer_results[canonical_url] = if import.source.is_a?(Hash)
                                                {
-                                                 contents: import.source[:contents],
-                                                 syntax: import.source[:syntax],
+                                                 **import.source,
                                                  source_map_url: canonical_url
                                                }
                                              else
@@ -500,7 +495,7 @@ def self.from_native(value, options)
           )
         when ::Sass::Value::Map
           ::SassC::Script::Value::Map.new(
-            value.contents.to_a.to_h { |k, v| [from_native(k, options), from_native(v, options)] }
+            value.contents.map.with_object({}) { |(k, v), h| h[from_native(k, options)] = from_native(v, options) }
           )
         when ::Sass::Value::Number
           ::SassC::Script::Value::Number.new(
@@ -563,7 +558,7 @@ def self.to_native(value)
           )
         when ::SassC::Script::Value::Map
           ::Sass::Value::Map.new(
-            value.value.to_a.to_h { |k, v| [to_native(k), to_native(v)] }
+            value.value.map.with_object({}) { |(k, v), h| h[to_native(k)] = to_native(v) }
           )
         when ::SassC::Script::Value::Number
           ::Sass::Value::Number.new(
@@ -629,8 +624,8 @@ def parse(...)
         decode_uri_hash_with_preserve_escaped = if unescaped.nil? || unescaped.empty?
                                                   decode_uri_hash
                                                 else
-                                                  decode_uri_hash.to_h do |key, value|
-                                                    [key, unescaped.include?(value) ? key : value]
+                                                  decode_uri_hash.map.with_object({}) do |(key, value), hash|
+                                                    hash[key] = unescaped.include?(value) ? key : value
                                                   end.freeze
                                                 end