Replace cast with type pun.

src/core/wrap.c

@@ -36,7 +36,8 @@ void *janet_nanbox_to_pointer(Janet x) {
 #else
     x.i64 = (x.i64 << 16) >> 16;
 #endif
-    return (void *)x.i64;
+
+    return x.pointer;
 }
 
 Janet janet_nanbox_from_pointer(void *p, uint64_t tagmask) {

src/include/janet/janet.h

@@ -342,6 +342,7 @@ union Janet {
     uint64_t u64;
     int64_t i64;
     double real;
+    void *pointer;
 };
 
 #define janet_u64(x) ((x).u64)

src/mainclient/line.c

@@ -35,7 +35,7 @@ int janet_line_getter(JanetArgs args) {
 
 static void simpleline(JanetBuffer *buffer) {
     buffer->count = 0;
-    char c;
+    int c;
     for (;;) {
         c = fgetc(stdin);
         if (feof(stdin) || c < 0) {