Do not compact positional args in envconfig

temporalio/lib/temporalio/env_config.rb

@@ -212,7 +212,7 @@ def to_h
       # Create a client connect config from this profile
       # @return [Array] Tuple of [positional_args, keyword_args] that can be splatted to Client.connect
       def to_client_connect_options
-        positional_args = [address, namespace].compact
+        positional_args = [address, namespace]
         tls_value = false
         if tls
           tls_value = tls.to_client_tls_options

temporalio/test/envconfig_test.rb

@@ -64,7 +64,7 @@ class EnvConfigTest < Test
   TOML
 
   # =============================================================================
-  # PROFILE LOADING TESTS (6 tests)
+  # PROFILE LOADING TESTS (7 tests)
   # =============================================================================
 
   def test_load_profile_from_file_default
@@ -184,6 +184,36 @@ def test_load_profile_env_overrides
     end
   end
 
+  def test_to_client_connect_options_preserves_nil_values
+    # Test that nil values in address/namespace are preserved in positional_args
+    profile_no_address = Temporalio::EnvConfig::ClientConfigProfile.new(
+      address: nil,
+      namespace: 'my-namespace'
+    )
+    args, = profile_no_address.to_client_connect_options
+    assert_equal 2, args.length, 'positional_args should always have exactly 2 elements'
+    assert_nil args[0], 'address should be nil in first position (not removed)'
+    assert_equal 'my-namespace', args[1], 'namespace should be in second position'
+
+    profile_both_nil = Temporalio::EnvConfig::ClientConfigProfile.new(
+      address: nil,
+      namespace: nil
+    )
+    args, = profile_both_nil.to_client_connect_options
+    assert_equal 2, args.length, 'positional_args should always have exactly 2 elements'
+    assert_nil args[0], 'address should be nil in first position'
+    assert_nil args[1], 'namespace should be nil in second position'
+
+    profile_both_present = Temporalio::EnvConfig::ClientConfigProfile.new(
+      address: 'my-address:7233',
+      namespace: 'my-namespace'
+    )
+    args, = profile_both_present.to_client_connect_options
+    assert_equal 2, args.length, 'positional_args should always have exactly 2 elements'
+    assert_equal 'my-address:7233', args[0], 'address should be in first position'
+    assert_equal 'my-namespace', args[1], 'namespace should be in second position'
+  end
+
   # =============================================================================
   # ENVIRONMENT VARIABLES TESTS (4 tests)
   # =============================================================================