Improve security and simplify code

- Make variable name more semantic
- Reduce cyclomatic complexities for the formula calculate function
- Support specified unzip size limit on open file options, avoid zip bombs vulnerability attack
- Typo fix for documentation and error message

1 files changed, 1 insertions, 1 deletions

diff --git a/errors_test.go b/errors_test.go
index 207e80a..971802f 100644
--- a/errors_test.go
+++ b/errors_test.go
@@ -21,5 +21,5 @@ func TestNewInvalidCellNameError(t *testing.T) {
 }
 
 func TestNewInvalidExcelDateError(t *testing.T) {
-	assert.EqualError(t, newInvalidExcelDateError(-1), "invalid date value -1.000000, negative values are not supported supported")
+	assert.EqualError(t, newInvalidExcelDateError(-1), "invalid date value -1.000000, negative values are not supported")
 }