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float NaN, +Inf, -Inf are encoded as corresponding string, which is inconsistent with json.Marshal in golang stdlib. json.Marshal will return error if float value can not be encoded in json. For the following code
type C struct {
Field float64 `json:"field"`
}
func (c C) MarshalLogObject(enc zapcore.ObjectEncoder) error {
enc.AddFloat64("field", c.Field)
return nil
}
c := C{
Field: math.NaN(),
}
logger.Error("reflection", zap.Reflect("c", c))
logger.Error("marshall", zap.Object("c", c))
The two logging statement will output different values
{"msg":"reflection","cError":"json: unsupported value: NaN"}
{"msg":"marshall","c":{"field":"NaN"}}
Output string for float value is undesired, since they are different types.