add auto rounding option to client config

api_config.go

@@ -18,6 +18,9 @@ type apiClientConfig struct {
 	apiSecret          string
 	nonceGenerator     func() string
 	timestampGenerator func() string
+	// have client implicitly round input prices/amounts to correct number of decimal places.
+	// used solely for consumers' convenience and will probably be removed at some point.
+	autoRounding bool
 }
 
 func defaultApiClientConfig() *apiClientConfig {
@@ -58,6 +61,12 @@ func NonceGenerator(nonceGen func() string) ApiOption {
 	}
 }
 
+func AutoRoundingEnabled() ApiOption {
+	return func(config *apiClientConfig) {
+		config.autoRounding = true
+	}
+}
+
 // 10x slower the than previous `fmt.Sprintf("%d", time.Now().UnixNano())`, should i worry?
 func defaultNonce() string {
 	return uuid.NewString()