## Description
The `init` method of the `Rand` struct was called twice: in the constructor and in the `init` function.
Closes: #XXXX
---
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## Description
Ref: https://github.com/cosmos/cosmos-sdk/issues/15170
Included in: #15515
Required to resolve a discrepancy between the sign mode being implemented in #15170 and the existing legacy one.
When calling tx builder [SetMsgs](https://github.com/cosmos/cosmos-sdk/blob/4a6a1e3cb8de459891cb0495052589673d14ef51/x/auth/tx/builder.go#L208) messages are coerced to an any type in [NewAnyWithValue](https://github.com/cosmos/cosmos-sdk/blob/4a6a1e3cb8de459891cb0495052589673d14ef51/codec/types/any.go#L61). This marshals a message as proto bytes. If a message has cosmos.Dec typed fields, and they are set to nil, the will be set to 0 during seriazliation in the [Dec.Marshal](https://github.com/cosmos/cosmos-sdk/blob/88909d6f2b86dee6969a76e1e0e3c106fe8fd20c/math/dec.go#L801) implementation.
This side effect *changes* the output of a JSON marshal before and after the call to Dec.Marshal, as shown below.
```go
rates := &stakingtypes.CommissionRates{}
MarshalJson(rates)
// {"rate":"0","max_rate":"0","max_change_rate":"0"}
MarshalProto(rates)
MarshalJson(rates)
//{"rate":"0.000000000000000000","max_rate":"0.000000000000000000","max_change_rate":"0.000000000000000000"}
```
An integration is test is also committed asserting the (now fixed) behavior above. Its asserts should be changed once a release of math is made and `/tests/go.mod` is updated.
---
### Author Checklist
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* [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
* [ ] added `!` to the type prefix if API or client breaking change
* [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
* [ ] provided a link to the relevant issue or specification
* [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/docs/building-modules)
* [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
* [ ] added a changelog entry to `CHANGELOG.md`
* [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
* [ ] updated the relevant documentation or specification
* [ ] reviewed "Files changed" and left comments if necessary
* [ ] confirmed all CI checks have passed
### Reviewers Checklist
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your handle next to the items reviewed if you only reviewed selected items.*
I have...
* [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
* [ ] confirmed `!` in the type prefix if API or client breaking change
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* [ ] reviewed documentation is accurate
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Marko
Đông Liều
Hieu Vu
Facundo Medica
Roman
Elias NaurandJulien Robert
Jacob Gadikian
Emmanuel T Odekeandmarbar3778
Dev Ojha
gribanoid
Matt Kocubinski
Jeancarlo Barrios
testinginprodandtestinginprod