System information

Geth version: 2021.03.02-alpha
OS & Version: Linux

Expected behaviour

Specifying --rpc.gascap=0 should allow infinite gas to be used for both eth_call and eth_estimateGas.

Actual behaviour

Specifying --rpc.gascap=0 allows infinite gas to be used for eth_call, but sets the gas cap for eth_estimateGas to 0, which causes every call to eth_estimateGas to fail.

Steps to reproduce the behaviour

1. Start tg with --private-api.addr
2. Start rpcdaemon with --chaindata and --private.api.addr (not sure if this issues is present with just one) and --rpc.gascap=0
3. Call eth_call that requires a large amount of gas (this should work)
4. Call eth_estimateGas for anything (this fails with "gas required exceeds allowance (0)"