Returns the total closed state of a position using costBasisAtClose snapshots.
Each partial in _partial stores costBasisAtClose — the running cost basis BEFORE
that partial was applied. This avoids replaying the full entry history on every call.
Cost-basis replay (simplified):
for each partial[i]:
closedDollar += (percent[i] / 100) × costBasisAtClose[i]
remainingCostBasis = costBasisAtClose[i] × (1 - percent[i] / 100)
// entries added AFTER last partial add directly to remainingCostBasis
remainingCostBasis += Σ entry.cost for entries[lastEntryCount..]
Returns the total closed state of a position using costBasisAtClose snapshots.
Each partial in _partial stores costBasisAtClose — the running cost basis BEFORE that partial was applied. This avoids replaying the full entry history on every call.
Cost-basis replay (simplified): for each partial[i]: closedDollar += (percent[i] / 100) × costBasisAtClose[i] remainingCostBasis = costBasisAtClose[i] × (1 - percent[i] / 100) // entries added AFTER last partial add directly to remainingCostBasis remainingCostBasis += Σ entry.cost for entries[lastEntryCount..]