Must  return the maximum amount of shares mint would allow to be deposited to receiver and not cause a revert, which must not be higher than the actual maximum that would be accepted (it should underestimate if necessary). 
This assumes that the user has infinite assets, i.e. must not rely on balanceOf of asset.
Could cause unexpected behavior in the future due to non-compliance with EIP-4626 standard.
Similar problem for Sentimentxyz:
https://github.com/sentimentxyz/protocol/pull/235/files
maxMint() and maxDeposit() should reflect the limitation of maxSupply.
Consider changing maxMint() and maxDeposit() to:
