diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..82f77436
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,19 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = tab
+
+[*.sh]
+indent_style = tab
+
+[*.proto]
+indent_style = space
+indent_size = 2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c380fdcd..b0aa90d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.4.1 (November 27, 2017)
+
+FEATURES:
+ - [common] `Keys()` method on `CMap`
+
+IMPROVEMENTS:
+ - [log] complex types now encoded as "%+v" by default if `String()` method is undefined (previously resulted in error)
+ - [log] logger logs its own errors
+
+BUG FIXES:
+ - [common] fixed `Kill()` to build on Windows (Windows does not have `syscall.Kill`)
+
 ## 0.4.0 (October 26, 2017)
 
 BREAKING:
diff --git a/clist/clist_test.go b/clist/clist_test.go
index 2063cf46..9d5272de 100644
--- a/clist/clist_test.go
+++ b/clist/clist_test.go
@@ -149,7 +149,7 @@ func _TestGCRandom(t *testing.T) {
 func TestScanRightDeleteRandom(t *testing.T) {
 
 	const numElements = 10000
-	const numTimes = 100000
+	const numTimes = 1000
 	const numScanners = 10
 
 	l := New()
diff --git a/db/mem_db.go b/db/mem_db.go
index 07742750..2f507321 100644
--- a/db/mem_db.go
+++ b/db/mem_db.go
@@ -2,6 +2,7 @@ package db
 
 import (
 	"fmt"
+	"sort"
 	"strings"
 	"sync"
 )
@@ -127,6 +128,8 @@ func (db *MemDB) IteratorPrefix(prefix []byte) Iterator {
 			it.keys = append(it.keys, key)
 		}
 	}
+	// and we need to sort them
+	sort.Strings(it.keys)
 	return it
 }
 
diff --git a/log/tm_logger.go b/log/tm_logger.go
index dc6932dd..d49e8d22 100644
--- a/log/tm_logger.go
+++ b/log/tm_logger.go
@@ -52,19 +52,28 @@ func NewTMLoggerWithColorFn(w io.Writer, colorFn func(keyvals ...interface{}) te
 // Info logs a message at level Info.
 func (l *tmLogger) Info(msg string, keyvals ...interface{}) {
 	lWithLevel := kitlevel.Info(l.srcLogger)
-	kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...)
+	if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil {
+		errLogger := kitlevel.Error(l.srcLogger)
+		kitlog.With(errLogger, msgKey, msg).Log("err", err)
+	}
 }
 
 // Debug logs a message at level Debug.
 func (l *tmLogger) Debug(msg string, keyvals ...interface{}) {
 	lWithLevel := kitlevel.Debug(l.srcLogger)
-	kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...)
+	if err := kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...); err != nil {
+		errLogger := kitlevel.Error(l.srcLogger)
+		kitlog.With(errLogger, msgKey, msg).Log("err", err)
+	}
 }
 
 // Error logs a message at level Error.
 func (l *tmLogger) Error(msg string, keyvals ...interface{}) {
 	lWithLevel := kitlevel.Error(l.srcLogger)
-	kitlog.With(lWithLevel, msgKey, msg).Log(keyvals...)
+	lWithMsg := kitlog.With(lWithLevel, msgKey, msg)
+	if err := lWithMsg.Log(keyvals...); err != nil {
+		lWithMsg.Log("err", err)
+	}
 }
 
 // With returns a new contextual logger with keyvals prepended to those passed
diff --git a/log/tm_logger_test.go b/log/tm_logger_test.go
index 8cd2f827..b2b600ad 100644
--- a/log/tm_logger_test.go
+++ b/log/tm_logger_test.go
@@ -1,12 +1,26 @@
 package log_test
 
 import (
+	"bytes"
 	"io/ioutil"
+	"strings"
 	"testing"
 
+	"github.com/go-logfmt/logfmt"
 	"github.com/tendermint/tmlibs/log"
 )
 
+func TestLoggerLogsItsErrors(t *testing.T) {
+	var buf bytes.Buffer
+
+	logger := log.NewTMLogger(&buf)
+	logger.Info("foo", "baz baz", "bar")
+	msg := strings.TrimSpace(buf.String())
+	if !strings.Contains(msg, logfmt.ErrInvalidKey.Error()) {
+		t.Errorf("Expected logger msg to contain ErrInvalidKey, got %s", msg)
+	}
+}
+
 func BenchmarkTMLoggerSimple(b *testing.B) {
 	benchmarkRunner(b, log.NewTMLogger(ioutil.Discard), baseInfoMessage)
 }
diff --git a/log/tmfmt_logger.go b/log/tmfmt_logger.go
index 2b464a6b..d0397971 100644
--- a/log/tmfmt_logger.go
+++ b/log/tmfmt_logger.go
@@ -35,7 +35,8 @@ type tmfmtLogger struct {
 }
 
 // NewTMFmtLogger returns a logger that encodes keyvals to the Writer in
-// Tendermint custom format.
+// Tendermint custom format. Note complex types (structs, maps, slices)
+// formatted as "%+v".
 //
 // Each log event produces no more than one call to w.Write.
 // The passed Writer must be safe for concurrent use by multiple goroutines if
@@ -103,7 +104,10 @@ KeyvalueLoop:
 			}
 		}
 
-		if err := enc.EncodeKeyval(keyvals[i], keyvals[i+1]); err != nil {
+		err := enc.EncodeKeyval(keyvals[i], keyvals[i+1])
+		if err == logfmt.ErrUnsupportedValueType {
+			enc.EncodeKeyval(keyvals[i], fmt.Sprintf("%+v", keyvals[i+1]))
+		} else if err != nil {
 			return err
 		}
 	}
diff --git a/log/tmfmt_logger_test.go b/log/tmfmt_logger_test.go
index 62eb32a0..a07b323c 100644
--- a/log/tmfmt_logger_test.go
+++ b/log/tmfmt_logger_test.go
@@ -30,8 +30,10 @@ func TestTMFmtLogger(t *testing.T) {
 	assert.Regexp(t, regexp.MustCompile(`N\[.+\] unknown \s+ a=1 err=error\n$`), buf.String())
 
 	buf.Reset()
-	err := logger.Log("std_map", map[int]int{1: 2}, "my_map", mymap{0: 0})
-	assert.NotNil(t, err)
+	if err := logger.Log("std_map", map[int]int{1: 2}, "my_map", mymap{0: 0}); err != nil {
+		t.Fatal(err)
+	}
+	assert.Regexp(t, regexp.MustCompile(`N\[.+\] unknown \s+ std_map=map\[1:2\] my_map=special_behavior\n$`), buf.String())
 
 	buf.Reset()
 	if err := logger.Log("level", "error"); err != nil {
diff --git a/process/process.go b/process/process.go
deleted file mode 100644
index 7d2ae914..00000000
--- a/process/process.go
+++ /dev/null
@@ -1,76 +0,0 @@
-package process
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"os/exec"
-	"time"
-)
-
-type Process struct {
-	Label      string
-	ExecPath   string
-	Args       []string
-	Pid        int
-	StartTime  time.Time
-	EndTime    time.Time
-	Cmd        *exec.Cmd        `json:"-"`
-	ExitState  *os.ProcessState `json:"-"`
-	InputFile  io.Reader        `json:"-"`
-	OutputFile io.WriteCloser   `json:"-"`
-	WaitCh     chan struct{}    `json:"-"`
-}
-
-// execPath: command name
-// args: args to command. (should not include name)
-func StartProcess(label string, dir string, execPath string, args []string, inFile io.Reader, outFile io.WriteCloser) (*Process, error) {
-	cmd := exec.Command(execPath, args...)
-	cmd.Dir = dir
-	cmd.Stdout = outFile
-	cmd.Stderr = outFile
-	cmd.Stdin = inFile
-	if err := cmd.Start(); err != nil {
-		return nil, err
-	}
-	proc := &Process{
-		Label:      label,
-		ExecPath:   execPath,
-		Args:       args,
-		Pid:        cmd.Process.Pid,
-		StartTime:  time.Now(),
-		Cmd:        cmd,
-		ExitState:  nil,
-		InputFile:  inFile,
-		OutputFile: outFile,
-		WaitCh:     make(chan struct{}),
-	}
-	go func() {
-		err := proc.Cmd.Wait()
-		if err != nil {
-			// fmt.Printf("Process exit: %v\n", err)
-			if exitError, ok := err.(*exec.ExitError); ok {
-				proc.ExitState = exitError.ProcessState
-			}
-		}
-		proc.ExitState = proc.Cmd.ProcessState
-		proc.EndTime = time.Now() // TODO make this goroutine-safe
-		err = proc.OutputFile.Close()
-		if err != nil {
-			fmt.Printf("Error closing output file for %v: %v\n", proc.Label, err)
-		}
-		close(proc.WaitCh)
-	}()
-	return proc, nil
-}
-
-func (proc *Process) StopProcess(kill bool) error {
-	defer proc.OutputFile.Close()
-	if kill {
-		// fmt.Printf("Killing process %v\n", proc.Cmd.Process)
-		return proc.Cmd.Process.Kill()
-	} else {
-		// fmt.Printf("Stopping process %v\n", proc.Cmd.Process)
-		return proc.Cmd.Process.Signal(os.Interrupt)
-	}
-}
diff --git a/process/util.go b/process/util.go
deleted file mode 100644
index 24cf3528..00000000
--- a/process/util.go
+++ /dev/null
@@ -1,22 +0,0 @@
-package process
-
-import (
-	. "github.com/tendermint/tmlibs/common"
-)
-
-// Runs a command and gets the result.
-func Run(dir string, command string, args []string) (string, bool, error) {
-	outFile := NewBufferCloser(nil)
-	proc, err := StartProcess("", dir, command, args, nil, outFile)
-	if err != nil {
-		return "", false, err
-	}
-
-	<-proc.WaitCh
-
-	if proc.ExitState.Success() {
-		return outFile.String(), true, nil
-	} else {
-		return outFile.String(), false, nil
-	}
-}
diff --git a/version/version.go b/version/version.go
index c1635d20..c30887b4 100644
--- a/version/version.go
+++ b/version/version.go
@@ -1,3 +1,3 @@
 package version
 
-const Version = "0.4.0"
+const Version = "0.4.1"