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fix: increase sdk.Dec maxApproxRootIterations (backport #12229) #12275

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Jun 16, 2022
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fix: increase sdk.Dec maxApproxRootIterations (backport #12229) #12275

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
* (genutil) [#12140](https://github.com/cosmos/cosmos-sdk/pull/12140) Fix staking's genesis JSON migrate in the `simd migrate v0.46` CLI command.
* (types) [#12154](https://github.com/cosmos/cosmos-sdk/pull/12154) Add `baseAccountGetter` to avoid invalid account error when create vesting account.
* (x/crisis) [#12208](https://github.com/cosmos/cosmos-sdk/pull/12208) Fix progress index of crisis invariant assertion logs.
* (types) [#12229](https://github.com/cosmos/cosmos-sdk/pull/12229) Increase sdk.Dec maxApproxRootIterations to 300

## [v0.46.0-rc1](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.46.0-rc1) - 2022-05-23

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2 changes: 1 addition & 1 deletion types/decimal.go
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Expand Up @@ -34,7 +34,7 @@ const (
maxDecBitLen = MaxBitLen + decimalTruncateBits

// max number of iterations in ApproxRoot function
maxApproxRootIterations = 100
maxApproxRootIterations = 300
)

var (
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3 changes: 2 additions & 1 deletion types/decimal_test.go
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Expand Up @@ -433,11 +433,12 @@ func (s *decimalTestSuite) TestApproxRoot() {
{sdk.SmallestDec(), 2, sdk.NewDecWithPrec(1, 9)}, // 1e-18 ^ (0.5) => 1e-9
{sdk.SmallestDec(), 3, sdk.MustNewDecFromStr("0.000000999999999997")}, // 1e-18 ^ (1/3) => 1e-6
{sdk.NewDecWithPrec(1, 8), 3, sdk.MustNewDecFromStr("0.002154434690031900")}, // 1e-8 ^ (1/3) ≈ 0.00215443469
{sdk.MustNewDecFromStr("9000002314687921634000000000000000000021394871242000000000000000"), 2, sdk.MustNewDecFromStr("94868342004527103646332858502867.899477053226766107")},
}

// In the case of 1e-8 ^ (1/3), the result repeats every 5 iterations starting from iteration 24
// (i.e. 24, 29, 34, ... give the same result) and never converges enough. The maximum number of
// iterations (100) causes the result at iteration 100 to be returned, regardless of convergence.
// iterations (300) causes the result at iteration 300 to be returned, regardless of convergence.

for i, tc := range testCases {
res, err := tc.input.ApproxRoot(tc.root)
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