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variable.c: reduce IV_INITIAL_SIZE from 4 to 2

saves 40% memory (60 -> 36 bytes) for objects with 1-2 instance variables, which is common for simple value objects like Point(@x, @y). the trade-off is one extra reallocation when growing from 2 to 4 IVs, but this is negligible since reallocations are rare compared to lookups. Co-authored-by: Claude <noreply@anthropic.com>

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1 file changed

src
- variable.c

`‎src/variable.c‎`

-Original file line number
+Diff line change
 static void iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val);
 -#define IV_INITIAL_SIZE 4
 +#define IV_INITIAL_SIZE 2
 static void
 iv_rehash(mrb_state *mrb, iv_tbl *t)

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