fix refcount management in •bit._cast
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@ -997,8 +997,9 @@ B bitcast_impl(B el0, B el1, B x) {
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if (rt==t_bitarr && (v(r)->refc!=1 || IS_SLICE(v(r)->type))) {
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r = taga(copy(xt, r));
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} else if (v(r)->refc!=1) {
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B pr = r;
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r = taga(TI(r,slice)(r, 0, a(r)->ia));
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sprnk(v(r),xr);
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arr_shSetI(a(r), xr, shObj(pr)); // safe to use pr because r has refcount>1 and slice only consumes one, leaving some behind
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}
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// Cast to output type
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v(r)->type = IS_SLICE(v(r)->type) ? TO_SLICE(rt) : rt;
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@ -1008,7 +1009,8 @@ B bitcast_impl(B el0, B el1, B x) {
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a->ia = zl;
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a->sh = &a->ia;
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} else {
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if (shObj(x)->refc>1) {
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if (shObj(r)->refc>1) {
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shObj(r)->refc--; // won't go to zero as refc>1; preparation for being overwritten by new shape
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usz* zsh = arr_shAlloc(a(r), xr);
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memcpy(zsh, sh, (xr-1)*sizeof(usz));
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sh = zsh;
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