diff --git a/calc.go b/calc.go
index 433efb80d72c6dde2c6fc581935e6bd33e421c36..8777bb94136cfd1e3bd5066c561de4f22ae5a63c 100644
--- a/calc.go
+++ b/calc.go
@@ -831,8 +831,8 @@ func (f *File) CalcCellValue(sheet, cell string, opts ...Options) (result string
 	if !rawCellValue {
 		styleIdx, _ = f.GetCellStyle(sheet, cell)
 	}
-	result = token.Value()
-	if isNum, precision, decimal := isNumeric(result); isNum && !rawCellValue {
+	if token.Type == ArgNumber && !token.Boolean {
+		_, precision, decimal := isNumeric(token.Value())
 		if precision > 15 {
 			result, err = f.formattedValue(&xlsxC{S: styleIdx, V: strings.ToUpper(strconv.FormatFloat(decimal, 'G', 15, 64))}, rawCellValue, CellTypeNumber)
 			return
@@ -840,7 +840,9 @@ func (f *File) CalcCellValue(sheet, cell string, opts ...Options) (result string
 		if !strings.HasPrefix(result, "0") {
 			result, err = f.formattedValue(&xlsxC{S: styleIdx, V: strings.ToUpper(strconv.FormatFloat(decimal, 'f', -1, 64))}, rawCellValue, CellTypeNumber)
 		}
+		return
 	}
+	result, err = f.formattedValue(&xlsxC{S: styleIdx, V: token.Value()}, rawCellValue, CellTypeInlineString)
 	return
 }
 
@@ -4281,7 +4283,7 @@ func (fn *formulaFuncs) EXP(argsList *list.List) formulaArg {
 	if number.Type == ArgError {
 		return number
 	}
-	return newStringFormulaArg(strings.ToUpper(fmt.Sprintf("%g", math.Exp(number.Number))))
+	return newNumberFormulaArg(math.Exp(number.Number))
 }
 
 // fact returns the factorial of a supplied number.
@@ -4359,7 +4361,7 @@ func (fn *formulaFuncs) FLOOR(argsList *list.List) formulaArg {
 			val--
 		}
 	}
-	return newStringFormulaArg(strings.ToUpper(fmt.Sprintf("%g", val*significance.Number)))
+	return newNumberFormulaArg(val * significance.Number)
 }
 
 // FLOORdotMATH function rounds a supplied number down to a supplied multiple
@@ -11570,12 +11572,10 @@ func (fn *formulaFuncs) ISNA(argsList *list.List) formulaArg {
 	if argsList.Len() != 1 {
 		return newErrorFormulaArg(formulaErrorVALUE, "ISNA requires 1 argument")
 	}
-	token := argsList.Front().Value.(formulaArg)
-	result := "FALSE"
-	if token.Type == ArgError && token.String == formulaErrorNA {
-		result = "TRUE"
+	if token := argsList.Front().Value.(formulaArg); token.Type == ArgError && token.String == formulaErrorNA {
+		return newBoolFormulaArg(true)
 	}
-	return newStringFormulaArg(result)
+	return newBoolFormulaArg(false)
 }
 
 // ISNONTEXT function tests if a supplied value is text. If not, the
diff --git a/calc_test.go b/calc_test.go
index 71d0acd0c7cfdb28c619f5ee6b3151d9c058f73b..a842a2365e970ef177c181d8889b0c87ff5c5a21 100644
--- a/calc_test.go
+++ b/calc_test.go
@@ -6311,13 +6311,31 @@ func TestFormulaRawCellValueOption(t *testing.T) {
 		raw      bool
 		expected string
 	}{
-		{"=\"10e3\"", false, "10000"},
+		{"=VALUE(\"1.0E-07\")", false, "0.00"},
+		{"=VALUE(\"1.0E-07\")", true, "0.0000001"},
+		{"=\"text\"", false, "$text"},
+		{"=\"text\"", true, "text"},
+		{"=\"10e3\"", false, "$10e3"},
 		{"=\"10e3\"", true, "10e3"},
-		{"=\"10\" & \"e3\"", false, "10000"},
+		{"=\"10\" & \"e3\"", false, "$10e3"},
 		{"=\"10\" & \"e3\"", true, "10e3"},
-		{"=\"1111111111111111\"", false, "1.11111111111111E+15"},
+		{"=10e3", false, "10000.00"},
+		{"=10e3", true, "10000"},
+		{"=\"1111111111111111\"", false, "$1111111111111111"},
 		{"=\"1111111111111111\"", true, "1111111111111111"},
-	}
+		{"=1111111111111111", false, "1111111111111110.00"},
+		{"=1111111111111111", true, "1.11111111111111E+15"},
+		{"=1444.00000000003", false, "1444.00"},
+		{"=1444.00000000003", true, "1444.00000000003"},
+		{"=1444.000000000003", false, "1444.00"},
+		{"=1444.000000000003", true, "1444"},
+		{"=ROUND(1444.00000000000003,2)", false, "1444.00"},
+		{"=ROUND(1444.00000000000003,2)", true, "1444"},
+	}
+	exp := "0.00;0.00;;$@"
+	styleID, err := f.NewStyle(&Style{CustomNumFmt: &exp})
+	assert.NoError(t, err)
+	assert.NoError(t, f.SetCellStyle("Sheet1", "A1", "A1", styleID))
 	for _, test := range rawTest {
 		assert.NoError(t, f.SetCellFormula("Sheet1", "A1", test.value))
 		val, err := f.CalcCellValue("Sheet1", "A1", Options{RawCellValue: test.raw})
diff --git a/sheet.go b/sheet.go
index f1267f7c80191ee00f2983cf050f94283ecf279d..f9f067a5cb963d38b93f24f402e9055cf9103655 100644
--- a/sheet.go
+++ b/sheet.go
@@ -363,7 +363,7 @@ func (f *File) SetSheetName(source, target string) error {
 	if err = checkSheetName(target); err != nil {
 		return err
 	}
-	if strings.EqualFold(target, source) {
+	if target == source {
 		return err
 	}
 	wb, _ := f.workbookReader()
diff --git a/sheet_test.go b/sheet_test.go
index 271262ee1c2de5d16a11eee44538a8649b75a229..5c96efc1d2e911b15fe93048b294314afe468270 100644
--- a/sheet_test.go
+++ b/sheet_test.go
@@ -465,8 +465,11 @@ func TestSetSheetName(t *testing.T) {
 	// Test set worksheet with the same name
 	assert.NoError(t, f.SetSheetName("Sheet1", "Sheet1"))
 	assert.Equal(t, "Sheet1", f.GetSheetName(0))
+	// Test set worksheet with the different name
+	assert.NoError(t, f.SetSheetName("Sheet1", "sheet1"))
+	assert.Equal(t, "sheet1", f.GetSheetName(0))
 	// Test set sheet name with invalid sheet name
-	assert.EqualError(t, f.SetSheetName("Sheet:1", "Sheet1"), ErrSheetNameInvalid.Error())
+	assert.Equal(t, f.SetSheetName("Sheet:1", "Sheet1"), ErrSheetNameInvalid)
 
 	// Test set worksheet name with existing defined name and auto filter
 	assert.NoError(t, f.AutoFilter("Sheet1", "A1:A2", nil))