all: switch gas limits from big.Int to uint64

contracts/chequebook/cheque.go

@@ -56,8 +56,8 @@ import (
 // * watching incoming ether
 
 var (
-	gasToCash = big.NewInt(2000000) // gas cost of a cash transaction using chequebook
-	// gasToDeploy = big.NewInt(3000000)
+	gasToCash = uint64(2000000) // gas cost of a cash transaction using chequebook
+	// gasToDeploy = uint64(3000000)
 )
 
 // Backend wraps all methods required for chequebook operation.

contracts/ens/ens.go

@@ -19,7 +19,6 @@ package ens
 //go:generate abigen --sol contract/ens.sol --pkg contract --out contract/ens.go
 
 import (
-	"math/big"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
@@ -163,7 +162,7 @@ func (self *ENS) Register(name string) (*types.Transaction, error) {
 	}
 
 	opts := self.TransactOpts
-	opts.GasLimit = big.NewInt(200000)
+	opts.GasLimit = 200000
 	return registrar.Contract.Register(&opts, label, self.TransactOpts.From)
 }
 
@@ -178,6 +177,6 @@ func (self *ENS) SetContentHash(name string, hash common.Hash) (*types.Transacti
 	}
 
 	opts := self.TransactOpts
-	opts.GasLimit = big.NewInt(200000)
+	opts.GasLimit = 200000
 	return resolver.Contract.SetContent(&opts, node, hash)
 }

contracts/ens/ens_test.go

@@ -37,7 +37,7 @@ func TestENS(t *testing.T) {
 	contractBackend := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}})
 	transactOpts := bind.NewKeyedTransactor(key)
 	// Workaround for bug estimating gas in the call to Register
-	transactOpts.GasLimit = big.NewInt(1000000)
+	transactOpts.GasLimit = 1000000
 
 	ens, err := DeployENS(transactOpts, contractBackend)
 	if err != nil {