KOS_OP_ATTR_INPLACE

• Style: EXTRA (OPCOUNT, CONST, NOARG, NOARG). Row a0 = operator selector and count, a1 = the attribute name.

• Stack: [..., obj, v0 .. v_{n-1}] → [...]. Reduce obj.attr in place with the count values left to right, store it back, drop the object and the values; pushes nothing (the special appends CONST None). Cold: the operator switch lives in the shared kos_inplace_reduce.

• Compiler form: Emitted by compile/inplace-attr when OBJ is an expression.

• Implementation: koskari/lib/opcode/ATTR_INPLACE.c