diff --git a/moo/lib/bigint.c b/moo/lib/bigint.c
index 3c99f66..a4cb033 100644
--- a/moo/lib/bigint.c
+++ b/moo/lib/bigint.c
@@ -1351,7 +1351,7 @@ static MOO_INLINE moo_oow_t multiply_unsigned_array_karatsuba (moo_t* moo, const
 	tmplen[0] = ndigits_xh + ndigits_yh;
 	tmplen[1] = ndigits_yl + ndigits_yh + 1; 
 	if (tmplen[1] < tmplen[0]) tmplen[1] = tmplen[0];
-	tmp[1] = (moo_liw_t*)moo_callocmem(moo, MOO_SIZEOF(moo_liw_t) * tmplen[1]); /* TODO: should i use the object memory? */
+	tmp[1] = (moo_liw_t*)moo_callocmem(moo, MOO_SIZEOF(moo_liw_t) * tmplen[1]); /* TODO: should i use the object memory? if not, reuse the buffer and minimize memory allocation */
 	if (!tmp[1]) goto oops;
 
 	/* make a temporary for (a0 + a1) and (a0 * b0) */
@@ -4433,7 +4433,7 @@ static moo_oow_t oow_to_text (moo_t* moo, moo_oow_t w, int flagged_radix, moo_oo
 	const char* _digitc;
 	int radix;
 
-	radix = flagged_radix & 0xFF;
+	radix = flagged_radix & MOO_INTTOSTR_RADIXMASK;
 	_digitc =  _digitc_array[!!(flagged_radix & MOO_INTTOSTR_LOWERCASE)];
 	MOO_ASSERT (moo, radix >= 2 && radix <= 36);
 
@@ -4755,7 +4755,7 @@ moo_oop_t moo_inttostr (moo_t* moo, moo_oop_t num, int flagged_radix)
 	int radix;
 	const char* _digitc;
 
-	radix = flagged_radix & 0xFF;
+	radix = flagged_radix & MOO_INTTOSTR_RADIXMASK;
 	_digitc =  _digitc_array[!!(flagged_radix & MOO_INTTOSTR_LOWERCASE)];
 	MOO_ASSERT (moo, radix >= 2 && radix <= 36);
 
diff --git a/moo/lib/fmtout.c b/moo/lib/fmtout.c
index 39a2562..554d16d 100644
--- a/moo/lib/fmtout.c
+++ b/moo/lib/fmtout.c
@@ -920,7 +920,7 @@ static MOO_INLINE int print_formatted (moo_t* moo, moo_ooi_t nargs, moo_fmtout_d
 
 	if (ignore_rcv)
 	{
-		arg = MOO_STACK_GETARG(moo, nargs, 0);	
+		arg = MOO_STACK_GETARG(moo, nargs, 0);
 		arg_state.idx = 1;
 	}
 	else
diff --git a/moo/lib/std.c b/moo/lib/std.c
index c3a616a..22e67fa 100644
--- a/moo/lib/std.c
+++ b/moo/lib/std.c
@@ -825,7 +825,6 @@ static int write_log (moo_t* moo, int fd, const moo_bch_t* ptr, moo_oow_t len)
 				xtn->log.out.len += len;
 				ptr += len;
 				len -= len;
-				
 			}
 		}
 	}
@@ -850,18 +849,12 @@ static void log_write (moo_t* moo, moo_bitmask_t mask, const moo_ooch_t* msg, mo
 	moo_oow_t ucslen, bcslen, msgidx;
 	int n, logfd;
 
-	if (mask & MOO_LOG_STDERR)
-	{
-		logfd = 2;
-	}
+	if (mask & MOO_LOG_STDERR) logfd = 2;
+	else if (mask & MOO_LOG_STDOUT) logfd = 1;
 	else
 	{
-		if (mask & MOO_LOG_STDOUT) logfd = 1;
-		else
-		{
-			logfd = xtn->log.fd;
-			if (logfd <= -1) return;
-		}
+		logfd = xtn->log.fd;
+		if (logfd <= -1) return;
 	}
 
 /* TODO: beautify the log message.