🎁 [Feature Request]: FungibleVault: support for overridable total_assets in conversion functions #674
Description
What is the feature you would like to see?
The FungibleVault trait exposes total_assets as overridable, but the internal conversion functions (convert_to_shares_with_rounding, convert_to_assets_with_rounding) call Self::total_assets(e) directly on the Vault struct. Any custom total_assets on the trait is ignored by the conversion math that deposit, mint, withdraw, and redeem all depend on.
Since Vault::total_assets is hardcoded to the contract's on-chain token balance, it's impossible to build yield-bearing vaults that deploy assets into external protocols (e.g. Blend). Share pricing will only reflect assets sitting idle in the contract, not the total managed position.
On Ethereum's ERC-4626, overriding totalAssets() flows through to all conversion logic, enabling strategy/debt-accounting patterns (e.g. Yearn). The Stellar vault currently lacks this capability.