Estimates the user-share deductions in charge_user_fees at
bundle.rs:653-851. Referral handling at bundle.rs:767-800 is omitted
because it only divides the same deducted shares between manager and
referrer. If assetPrecision is zero, this helper returns a zero fee value;
the Rust function reports a division error at bundle.rs:829-834.
Estimates the user-share deductions in
charge_user_feesatbundle.rs:653-851. Referral handling atbundle.rs:767-800is omitted because it only divides the same deducted shares between manager and referrer. IfassetPrecisionis zero, this helper returns a zero fee value; the Rust function reports a division error atbundle.rs:829-834.