[Copilot]

NetworkInfo wrote EigenTrustAlpha as 8 little-endian float64 bits. The API docs and running networks use a decimal string such as "0.1". As a result, the SDK read "0.123" from the network as 1.08637830059e-312 and sent a value other than the string form the network config uses. The issue discussion settled on following the protocol and fixing the SDK.

• Encoding
  • SetEigenTrustAlpha now writes strconv.FormatFloat(alpha, 'f', -1, 64).
  • EigenTrustAlpha() parses the string and returns 0 when the parameter is unset, as before. It panics on an unparsable or out-of-range stored value, as before.
• Validation
  • FromProtoMessage and Unmarshal now parse the value with strconv.ParseFloat and reject NaN and values outside [0, 1].
• Tests
  • Fixtures and error expectations in network_info_test.go now use the string encoding, including the valid marshalled NetworkInfo bytes.

var n netmap.NetworkInfo
n.SetEigenTrustAlpha(0.1) // wire value: []byte("0.1")

Compatibility: this is a wire-format change. Parameters in the old binary float64 form, as written by earlier SDK versions, now fail to unmarshal with a parse error.

• Fixes netmap: EigenTrustAlpha config encoding diverges from the protocol #653

[roman-khimov]

Not needed, see issue.