feat: add uint IsNil method (#13381)

math/CHANGELOG.md

@@ -31,4 +31,5 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+* [#13381](https://github.com/cosmos/cosmos-sdk/pull/13381) Add uint `IsNil` method.
 * [#12634](https://github.com/cosmos/cosmos-sdk/pull/12634) Move `sdk.Dec` to math package, call it `LegacyDec`.

math/uint.go

@@ -18,6 +18,11 @@ func (u Uint) BigInt() *big.Int {
 	return new(big.Int).Set(u.i)
 }
 
+// IsNil returns true if Uint is uninitialized
+func (u Uint) IsNil() bool {
+	return u.i == nil
+}
+
 // NewUintFromBigUint constructs Uint from big.Uint
 func NewUintFromBigInt(i *big.Int) Uint {
 	u, err := checkNewUint(i)

math/uint_test.go

@@ -91,6 +91,11 @@ func (s *uintTestSuite) TestUintPanics() {
 	s.Require().True(sdkmath.ZeroUint().LTE(sdkmath.OneUint()))
 }
 
+func (s *uintTestSuite) TestIsNil() {
+	s.Require().False(sdkmath.OneUint().IsNil())
+	s.Require().True(sdkmath.Uint{}.IsNil())
+}
+
 func (s *uintTestSuite) TestArithUint() {
 	for d := 0; d < 1000; d++ {
 		n1 := uint64(rand.Uint32())