Invalid string format. Only non-negative integers in decimal representation supported.

[Wgil]

Dear Telescope team,

I have the following definition in a proto file:

message QueryOpenEstResponse {
  string weight_balance_ratio = 2 [
    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
    (gogoproto.nullable) = false
  ];
}

The issue that I'm having is that such field can be a negative number as it's allowed in CosmosSDK but since it's decoded using Decimal.fromAtomics after running yarn codegen:

case 2:
          message.weightBalanceRatio = Decimal.fromAtomics(reader.string(), 18).toString();

I get an error trying to decode its value:

Error: Invalid string format. Only non-negative integers in decimal representation supported.
    at new Decimal (decimal.js:103:1)
    at Decimal.fromAtomics (decimal.js:59:1)
    at Object.decode (query.ts:2215:48)
    at eval (query.rpc.Query.ts:119:54)

Do you guys have any alternative for this?
Thank you