diff --git a/src/core/bigint.c b/src/core/bigint.c
index 99165139..a256e97b 100644
--- a/src/core/bigint.c
+++ b/src/core/bigint.c
@@ -85,7 +85,8 @@ static const JanetAbstractType bi_uint64_type = {
 
 static int parse_int64(const char *str, bi_int64 *box) {
     char *endptr;
-    int base = (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) ? 16 : 10;
+    int base = ((str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) ||
+                (str[0] == '-' && str[1] == '0' && (str[2] == 'x' || str[2] == 'X'))) ? 16 : 10;
     errno = 0;
     *box = (bi_int64)strtoll(str, &endptr, base);
     if ((errno == ERANGE && (*box == LLONG_MAX || *box == LLONG_MIN)) ||
@@ -239,6 +240,33 @@ static Janet cfun_##type##_##name##_mut(int32_t argc, Janet *argv) { \
     return janet_wrap_abstract(box); \
 }
 
+#define DIVMETHOD_SIGNED(type,name,oper) \
+static Janet cfun_##type##_##name(int32_t argc, Janet *argv) { \
+    janet_arity(argc, 2, -1);                       \
+    bi_##type *box = (bi_##type *)janet_abstract(&bi_##type##_type, sizeof(bi_##type)); \
+    *box = check_bi_##type(argv[0]); \
+    for (int i=1;i<argc;i++) { \
+      bi_##type value =  check_bi_##type(argv[i]); \
+      if (value == 0) janet_panic("division by zero"); \
+      if ((value == -1) && (*box == INT64_MIN)) janet_panic("INT64_MIN divided by -1"); \
+      *box oper##= check_bi_##type(argv[i]); \
+    } \
+    return janet_wrap_abstract(box); \
+} \
+ \
+static Janet cfun_##type##_##name##_mut(int32_t argc, Janet *argv) { \
+    janet_arity(argc, 2, -1); \
+    bi_##type *box = (bi_##type *)janet_getabstract(argv,0,&bi_##type##_type); \
+    for (int i=1;i<argc;i++) { \
+      bi_##type value =  check_bi_##type(argv[i]); \
+      if (value == 0) janet_panic("division by zero"); \
+      if ((value == -1) && (*box == INT64_MIN)) janet_panic("INT64_MIN divided by -1"); \
+      *box oper##= check_bi_##type(argv[i]); \
+    } \
+    return janet_wrap_abstract(box); \
+}
+
+
 
 
 #define COMPMETHOD(type,name,oper) \
@@ -254,8 +282,8 @@ static Janet cfun_##type##_##name(int32_t argc, Janet *argv) { \
 OPMETHOD(int64, add, +)
 OPMETHOD(int64, sub, -)
 OPMETHOD(int64, mul, *)
-DIVMETHOD(int64, div, /)
-DIVMETHOD(int64, mod, %)
+DIVMETHOD_SIGNED(int64, div, /)
+DIVMETHOD_SIGNED(int64, mod, %)
 OPMETHOD(int64, and, &)
 OPMETHOD(int64, or, |)
 OPMETHOD(int64, xor, ^)
@@ -287,6 +315,7 @@ COMPMETHOD(uint64, ne, !=)
 
 #undef OPMETHOD
 #undef DIVMETHOD
+#undef DIVMETHOD_SIGNED
 #undef COMPMETHOD
 
 static JanetMethod int64_methods[] = {
diff --git a/test/suite6.janet b/test/suite6.janet
index 0519f729..3d855fb8 100644
--- a/test/suite6.janet
+++ b/test/suite6.janet
@@ -23,44 +23,70 @@
 
 # some tests for bigint 
 
+(def i64 bigint/int64)
+(def u64 bigint/uint64)
+
 (assert-no-error
  "create some uint64 bigints"
  (do
    # from number
-   (def a (bigint/uint64 10))
+   (def a (u64 10))
    # max double we can convert to int (2^53)
-   (def b (bigint/uint64 0x1fffffffffffff))
-   (def b (bigint/uint64 (math/pow 2 53)))
+   (def b (u64 0x1fffffffffffff))
+   (def b (u64 (math/pow 2 53)))
    # from string 
-   (def c (bigint/uint64 "0xffffffffffffffff"))
-   (def d (bigint/uint64 "123456789"))))
+   (def c (u64 "0xffffffffffffffff"))
+   (def d (u64 "123456789"))))
 
 (assert-no-error
  "create some int64 bigints"
  (do
    # from number
-   (def a (bigint/int64 -10))
+   (def a (i64 -10))
    # max double we can convert to int (2^53)
-   (def b (bigint/int64 0x1fffffffffffff))
-   (def b (bigint/int64 (math/pow 2 53)))
+   (def b (i64 0x1fffffffffffff))
+   (def b (i64 (math/pow 2 53)))
    # from string 
-   (def c (bigint/int64 "0x7fffffffffffffff"))
-   (def d (bigint/int64 "123456789"))))
+   (def c (i64 "0x7fffffffffffffff"))
+   (def d (i64 "123456789"))))
 
 (assert-error
  "bad initializers"
  (do
    # double to big to be converted to uint64 without truncation (2^53 + 1)
-   (def b (bigint/uint64 (+ 0xffff_ffff_ffff_ff 1)))
-   (def b (bigint/uint64 (+ (math/pow 2 53) 1)))
+   (def b (u64 (+ 0xffff_ffff_ffff_ff 1)))
+   (def b (u64 (+ (math/pow 2 53) 1)))
    # out of range 65 bits
-   (def c (bigint/uint64 "0x1ffffffffffffffff"))
+   (def c (u64 "0x1ffffffffffffffff"))
    # just to big     
-   (def d (bigint/uint64 "123456789123456789123456789"))))
+   (def d (u64 "123456789123456789123456789"))))
+
+(assert (:== (:/ (u64 "0xffffffffffffffff") 8 2) "0xfffffffffffffff") "bigint operations")
+(assert (let [a (u64 0xff)] (:== (:+ a a a a) (:* a 2 2))) "bigint operations")
+
+(assert-error
+ "trap INT64_MIN / -1"
+ (:/ (bigint/int64 "-0x8000000000000000") -1))
+
+# in place operators
+(assert (let [a (u64 1e10)] (:+! a 1000000 "1000000" "0xffff") (:== a 10002065535)) "in place operators")
+
+# int64 typed arrays
+(assert (let [t (tarray/new :int64 10)
+              b (i64 1000)]
+          (set (t 0) 1000)
+          (set (t 1) b)
+          (set (t 2) "1000")
+          (set (t 3) (t 0))
+          (set (t 4) (u64 1000))
+          (and 
+           (:== (t 0) (t 1))
+           (:== (t 1) (t 2))
+           (:== (t 2) (t 3))
+           (:== (t 3) (t 4))
+           ))
+        "int64 typed arrays")
 
-(assert (:== (:/ (bigint/uint64 "0xffffffffffffffff") 8 2) "0xfffffffffffffff") "bigint operations")
-(assert (let [a (bigint/uint64 0xff)] (:== (:+ a a a a) (:* a 2 2))) "bigint operations")
-        
 
 
 (end-suite)