diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf7beaebc581..6fbb743865e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# 1.9.1 (2023-07-17)
+
+### Bugfixes
+
+#### stdlib
+
+- *(serialization)* Fix `Serializable` with converter parsing `null` value ([#13656](https://github.com/crystal-lang/crystal/pull/13656), thanks @straight-shoota)
+
+#### compiler
+
+- *(codegen)* Fix generated cc command for cross compile ([#13661](https://github.com/crystal-lang/crystal/pull/13661), thanks @fnordfish)
+
 # 1.9.0 (2023-07-11)
 ### Breaking changes
 
diff --git a/spec/std/json/serializable_spec.cr b/spec/std/json/serializable_spec.cr
index 0cc9d662cc93..042e42ff5fd5 100644
--- a/spec/std/json/serializable_spec.cr
+++ b/spec/std/json/serializable_spec.cr
@@ -212,6 +212,20 @@ class JSONAttrWithTimeEpoch
   property value : Time
 end
 
+class JSONAttrNilableWithTimeEpoch
+  include JSON::Serializable
+
+  @[JSON::Field(converter: Time::EpochConverter)]
+  property value : Time?
+end
+
+class JSONAttrDefaultWithTimeEpoch
+  include JSON::Serializable
+
+  @[JSON::Field(converter: Time::EpochConverter)]
+  property value : Time = Time.unix(0)
+end
+
 class JSONAttrWithTimeEpochMillis
   include JSON::Serializable
 
@@ -791,6 +805,16 @@ describe "JSON mapping" do
     end
   end
 
+  it "converter with null value (#13655)" do
+    JSONAttrNilableWithTimeEpoch.from_json(%({"value": null})).value.should be_nil
+    JSONAttrNilableWithTimeEpoch.from_json(%({"value":1459859781})).value.should eq Time.unix(1459859781)
+  end
+
+  it "converter with default value" do
+    JSONAttrDefaultWithTimeEpoch.from_json(%({"value": null})).value.should eq Time.unix(0)
+    JSONAttrDefaultWithTimeEpoch.from_json(%({"value":1459859781})).value.should eq Time.unix(1459859781)
+  end
+
   it "uses Time::EpochConverter" do
     string = %({"value":1459859781})
     json = JSONAttrWithTimeEpoch.from_json(string)
diff --git a/spec/std/kernel_spec.cr b/spec/std/kernel_spec.cr
index efe5e81563e4..149e6385ac97 100644
--- a/spec/std/kernel_spec.cr
+++ b/spec/std/kernel_spec.cr
@@ -294,64 +294,3 @@ describe "hardware exception" do
     error.should contain("Stack overflow")
   end
 end
-
-private def compile_and_run_exit_handler(&block : Process -> _)
-  with_tempfile("source_file") do |source_file|
-    File.write(source_file, <<-CRYSTAL)
-      at_exit { print "Exiting" }
-      print "."
-      STDOUT.flush
-      sleep
-      CRYSTAL
-    output = nil
-    compile_file(source_file) do |executable_file|
-      error = IO::Memory.new
-      process = Process.new executable_file, output: :pipe, error: error
-
-      spawn do
-        process.output.read_byte
-        block.call(process)
-        output = process.output.gets_to_end
-      end
-
-      status = process.wait
-      {status, output, error.to_s}
-    end
-  end
-end
-
-describe "default interrupt handlers", tags: %w[slow] do
-  # TODO: Implementation for sending console control commands on Windows.
-  # So long this behaviour can only be tested manually.
-  #
-  # ```
-  # lib LibC
-  #  fun GenerateConsoleCtrlEvent(dwCtrlEvent : DWORD, dwProcessGroupId : DWORD) : BOOL
-  # end
-
-  # at_exit { print "Exiting"; }
-  # print "."
-  # STDOUT.flush
-  # LibC.GenerateConsoleCtrlEvent(LibC::CTRL_C_EVENT, 0)
-  # sleep
-  # ```
-  {% unless flag?(:windows) %}
-    it "handler for SIGINT" do
-      status, output, _ = compile_and_run_exit_handler(&.signal(Signal::INT))
-      output.should eq "Exiting"
-      status.inspect.should eq "Process::Status[130]"
-    end
-
-    it "handler for SIGTERM" do
-      status, output, _ = compile_and_run_exit_handler(&.terminate)
-      output.should eq "Exiting"
-      status.inspect.should eq "Process::Status[143]"
-    end
-  {% end %}
-
-  it "no handler for SIGKILL" do
-    status, output, _ = compile_and_run_exit_handler(&.terminate(graceful: false))
-    output.should eq ""
-    status.inspect.should eq {{ flag?(:unix) ? "Process::Status[Signal::KILL]" : "Process::Status[1]" }}
-  end
-end
diff --git a/spec/std/yaml/serializable_spec.cr b/spec/std/yaml/serializable_spec.cr
index 7a098283e808..a8a7e3558b90 100644
--- a/spec/std/yaml/serializable_spec.cr
+++ b/spec/std/yaml/serializable_spec.cr
@@ -221,6 +221,20 @@ class YAMLAttrWithTimeEpoch
   property value : Time
 end
 
+class YAMLAttrNilableWithTimeEpoch
+  include YAML::Serializable
+
+  @[YAML::Field(converter: Time::EpochConverter)]
+  property value : Time?
+end
+
+class YAMLAttrDefaultWithTimeEpoch
+  include YAML::Serializable
+
+  @[YAML::Field(converter: Time::EpochConverter)]
+  property value : Time = Time.unix(0)
+end
+
 class YAMLAttrWithTimeEpochMillis
   include YAML::Serializable
 
@@ -871,6 +885,16 @@ describe "YAML::Serializable" do
     end
   end
 
+  it "converter with null value (#13655)" do
+    YAMLAttrNilableWithTimeEpoch.from_yaml(%({"value": null})).value.should be_nil
+    YAMLAttrNilableWithTimeEpoch.from_yaml(%({"value":1459859781})).value.should eq Time.unix(1459859781)
+  end
+
+  it "converter with default value" do
+    YAMLAttrDefaultWithTimeEpoch.from_yaml(%({"value": null})).value.should eq Time.unix(0)
+    YAMLAttrDefaultWithTimeEpoch.from_yaml(%({"value":1459859781})).value.should eq Time.unix(1459859781)
+  end
+
   it "uses Time::EpochConverter" do
     string = %({"value":1459859781})
     yaml = YAMLAttrWithTimeEpoch.from_yaml(string)
diff --git a/src/VERSION b/src/VERSION
index f8e233b27332..9ab8337f3962 100644
--- a/src/VERSION
+++ b/src/VERSION
@@ -1 +1 @@
-1.9.0
+1.9.1
diff --git a/src/compiler/crystal/compiler.cr b/src/compiler/crystal/compiler.cr
index f8e02b799859..f32ecd344be1 100644
--- a/src/compiler/crystal/compiler.cr
+++ b/src/compiler/crystal/compiler.cr
@@ -323,8 +323,9 @@ module Crystal
 
         target_machine.emit_obj_to_file llvm_mod, output_filename
       end
-
-      _, command, args = linker_command(program, [output_filename], output_filename, nil)
+      object_names = [output_filename]
+      output_filename = output_filename.rchop(unit.object_extension)
+      _, command, args = linker_command(program, object_names, output_filename, nil)
       print_command(command, args)
     end
 
@@ -684,7 +685,7 @@ module Crystal
       getter original_name
       getter llvm_mod
       getter? reused_previous_compilation = false
-      @object_extension : String
+      getter object_extension : String
 
       def initialize(@compiler : Compiler, program : Program, @name : String,
                      @llvm_mod : LLVM::Module, @output_dir : String, @bc_flags_changed : Bool)
diff --git a/src/crystal/system/process.cr b/src/crystal/system/process.cr
index 8a5598fc7b16..e6d1a05898b9 100644
--- a/src/crystal/system/process.cr
+++ b/src/crystal/system/process.cr
@@ -56,9 +56,6 @@ struct Crystal::System::Process
   # thread.
   # def self.start_interrupt_loop
 
-  # Trap interrupt to exit normally with `at_exit` handlers being executed.
-  # def self.setup_default_interrupt_handler
-
   # Whether the process identified by *pid* is still registered in the system.
   # def self.exists?(pid : Int) : Bool
 
@@ -80,6 +77,15 @@ struct Crystal::System::Process
 
   # Changes the root directory for the current process.
   # def self.chroot(path : String)
+
+  enum Interrupt
+    # sigint, ctrl-c or ctrl-break events
+    USER_SIGNALLED
+    # sighup or closed event
+    TERMINAL_DISCONNECTED
+    # sigterm, logoff or shutdown events
+    SESSION_ENDED
+  end
 end
 
 module Crystal::System
diff --git a/src/crystal/system/unix/process.cr b/src/crystal/system/unix/process.cr
index 9212226d9aa4..240c97f54d3b 100644
--- a/src/crystal/system/unix/process.cr
+++ b/src/crystal/system/unix/process.cr
@@ -58,8 +58,28 @@ struct Crystal::System::Process
     raise RuntimeError.from_errno("kill") if ret < 0
   end
 
-  def self.on_interrupt(&handler : ->) : Nil
-    ::Signal::INT.trap { |_signal| handler.call }
+  def self.on_interrupt(&handler : Interrupt ->) : Nil
+    sig_handler = Proc(::Signal, Nil).new do |signal|
+      int_type = case signal
+                 when .int?
+                   Interrupt::USER_SIGNALLED
+                 when .hup?
+                   Interrupt::TERMINAL_DISCONNECTED
+                 when .term?
+                   Interrupt::SESSION_ENDED
+                 else
+                   Interrupt::USER_SIGNALLED
+                 end
+      handler.call int_type
+
+      # ignore prevents system defaults and clears registered interrupts
+      # hence we need to re-register
+      signal.ignore
+      Process.on_interrupt &handler
+    end
+    ::Signal::INT.trap &sig_handler
+    ::Signal::HUP.trap &sig_handler
+    ::Signal::TERM.trap &sig_handler
   end
 
   def self.ignore_interrupts! : Nil
@@ -74,12 +94,6 @@ struct Crystal::System::Process
     # do nothing; `Crystal::System::Signal.start_loop` takes care of this
   end
 
-  def self.setup_default_interrupt_handlers
-    # Status 128 + signal number indicates process exit was caused by the signal.
-    ::Signal::INT.trap { ::exit 128 + ::Signal::INT.value }
-    ::Signal::TERM.trap { ::exit 128 + ::Signal::TERM.value }
-  end
-
   def self.exists?(pid)
     ret = LibC.kill(pid, 0)
     if ret == 0
diff --git a/src/crystal/system/win32/process.cr b/src/crystal/system/win32/process.cr
index e39db2f46fe4..5af21a395963 100644
--- a/src/crystal/system/win32/process.cr
+++ b/src/crystal/system/win32/process.cr
@@ -14,6 +14,7 @@ struct Crystal::System::Process
   @@interrupt_count = Crystal::AtomicSemaphore.new
   @@win32_interrupt_handler : LibC::PHANDLER_ROUTINE?
   @@setup_interrupt_handler = Atomic::Flag.new
+  @@last_interrupt = Interrupt::USER_SIGNALLED
 
   def initialize(process_info)
     @pid = process_info.dwProcessId
@@ -103,7 +104,16 @@ struct Crystal::System::Process
   def self.on_interrupt(&@@interrupt_handler : ->) : Nil
     restore_interrupts!
     @@win32_interrupt_handler = handler = LibC::PHANDLER_ROUTINE.new do |event_type|
-      next 0 unless event_type.in?(LibC::CTRL_C_EVENT, LibC::CTRL_BREAK_EVENT)
+      @@last_interrupt = case event_type
+                         when LibC::CTRL_C_EVENT, LibC::CTRL_BREAK_EVENT
+                           Interrupt::USER_SIGNALLED
+                         when LibC::CTRL_CLOSE_EVENT
+                           Interrupt::TERMINAL_DISCONNECTED
+                         when LibC::CTRL_LOGOFF_EVENT, LibC::CTRL_SHUTDOWN_EVENT
+                           Interrupt::SESSION_ENDED
+                         else
+                           next 0
+                         end
       @@interrupt_count.signal
       1
     end
@@ -136,8 +146,9 @@ struct Crystal::System::Process
 
         if handler = @@interrupt_handler
           non_nil_handler = handler # if handler is closured it will also have the Nil type
+          int_type = @@last_interrupt
           spawn do
-            non_nil_handler.call
+            non_nil_handler.call int_type
           rescue ex
             ex.inspect_with_backtrace(STDERR)
             STDERR.puts("FATAL: uncaught exception while processing interrupt handler, exiting")
@@ -149,13 +160,6 @@ struct Crystal::System::Process
     end
   end
 
-  def self.setup_default_interrupt_handlers
-    on_interrupt do
-      # Exit code 3 indicates `std::abort` was called which corresponds to the interrupt handler
-      ::exit 3
-    end
-  end
-
   def self.exists?(pid)
     handle = LibC.OpenProcess(LibC::PROCESS_QUERY_INFORMATION, 0, pid)
     return false unless handle
diff --git a/src/json/serialization.cr b/src/json/serialization.cr
index 386be1191887..610979517a18 100644
--- a/src/json/serialization.cr
+++ b/src/json/serialization.cr
@@ -219,8 +219,14 @@ module JSON
           {% for name, value in properties %}
             when {{value[:key]}}
               begin
-                {% if (value[:has_default] && !value[:nilable]) || value[:root] %}
-                  next if pull.read_null?
+                {% if value[:has_default] || value[:nilable] || value[:root] %}
+                  if pull.read_null?
+                    {% if value[:nilable] %}
+                      %var{name} = nil
+                      %found{name} = true
+                    {% end %}
+                    next
+                  end
                 {% end %}
 
                 %var{name} =
diff --git a/src/kernel.cr b/src/kernel.cr
index 5291a4dc57f1..7bca29cef605 100644
--- a/src/kernel.cr
+++ b/src/kernel.cr
@@ -569,7 +569,6 @@ end
   {% else %}
     Crystal::System::Signal.setup_default_handlers
   {% end %}
-  Crystal::System::Process.setup_default_interrupt_handlers
 
   # load debug info on start up of the program is executed with CRYSTAL_LOAD_DEBUG_INFO=1
   # this will make debug info available on print_frame that is used by Crystal's segfault handler
diff --git a/src/lib_c/x86_64-windows-msvc/c/consoleapi.cr b/src/lib_c/x86_64-windows-msvc/c/consoleapi.cr
index 680e199be2ab..2938b544ddcc 100644
--- a/src/lib_c/x86_64-windows-msvc/c/consoleapi.cr
+++ b/src/lib_c/x86_64-windows-msvc/c/consoleapi.cr
@@ -14,8 +14,11 @@ lib LibC
   fun GetConsoleCP : DWORD
   fun GetConsoleOutputCP : DWORD
 
-  CTRL_C_EVENT     = 0
-  CTRL_BREAK_EVENT = 1
+  CTRL_C_EVENT        = 0
+  CTRL_BREAK_EVENT    = 1
+  CTRL_CLOSE_EVENT    = 2
+  CTRL_LOGOFF_EVENT   = 5
+  CTRL_SHUTDOWN_EVENT = 6
 
   alias PHANDLER_ROUTINE = DWORD -> BOOL
 
diff --git a/src/process.cr b/src/process.cr
index 0eea5263b223..159b08b39eaa 100644
--- a/src/process.cr
+++ b/src/process.cr
@@ -58,10 +58,6 @@ class Process
   # * On Unix-like systems, this traps `SIGINT`.
   # * On Windows, this captures <kbd>Ctrl</kbd> + <kbd>C</kbd> and
   #   <kbd>Ctrl</kbd> + <kbd>Break</kbd> signals sent to a console application.
-  #
-  # The default interrupt handler calls `::exit` to ensure `at_exit` handlers
-  # execute. It returns a platform-specific status code indicating an interrupt
-  # (`130` on Unix, `3` on Windows).
   def self.on_interrupt(&handler : ->) : Nil
     Crystal::System::Process.on_interrupt(&handler)
   end
@@ -76,14 +72,8 @@ class Process
   end
 
   # Restores default handling of interrupt requests.
-  #
-  # The default interrupt handler calls `::exit` to ensure `at_exit` handlers
-  # execute. It returns a platform-specific status code indicating an interrupt
-  # (`130` on Unix, `3` on Windows).
   def self.restore_interrupts! : Nil
     Crystal::System::Process.restore_interrupts!
-
-    Crystal::System::Process.setup_default_interrupt_handlers
   end
 
   # Returns `true` if the process identified by *pid* is valid for
@@ -311,12 +301,10 @@ class Process
     end
   end
 
-  {% if flag?(:unix) %}
-    # :nodoc:
-    def initialize(pid : LibC::PidT)
-      @process_info = Crystal::System::Process.new(pid)
-    end
-  {% end %}
+  # :nodoc:
+  def initialize(pid : LibC::PidT)
+    @process_info = Crystal::System::Process.new(pid)
+  end
 
   # Sends *signal* to this process.
   #
diff --git a/src/yaml/serialization.cr b/src/yaml/serialization.cr
index 30e9fa6640d2..d5fae8dfe9c0 100644
--- a/src/yaml/serialization.cr
+++ b/src/yaml/serialization.cr
@@ -224,8 +224,14 @@ module YAML
             {% for name, value in properties %}
               when {{value[:key]}}
                 begin
-                  {% if value[:has_default] && !value[:nilable] %}
-                    next if YAML::Schema::Core.parse_null?(value_node)
+                  {% if value[:has_default] || value[:nilable] %}
+                    if YAML::Schema::Core.parse_null?(value_node)
+                      {% if value[:nilable] %}
+                        %var{name} = nil
+                        %found{name} = true
+                      {% end %}
+                      next
+                    end
                   {% end %}
 
                   %var{name} =