support non-string default field values (numbers, booleans, lists of …

…them)

src/typing/field.ts

@@ -22,6 +22,7 @@ export class Field extends DataClass implements Bindable<FieldBindingContext, Fi
         if (!this.type.context) {
             this.type = this.type.bind({ field: this });
         }
+        this.default = this.type.parseDefault(this.default);
     }
 
     bind(context: FieldBindingContext) {

src/typing/field_type/base.tsx

@@ -30,6 +30,10 @@ export abstract class FieldType<InstanceType extends FieldType = any>
         return "";
     }
 
+    parseDefault(value: any): string {
+        return `${value}`;
+    }
+
     bind(context: FieldTypeBindingContext): InstanceType {
         let instance = this.copy();
         instance.context = context;

src/typing/field_type/boolean.tsx

@@ -22,6 +22,16 @@ export class Boolean extends FieldType<Boolean> {
         return `false`;
     }
 
+    parseDefault(value: number | string | boolean): string {
+        if (typeof value == "boolean") {
+            return value ? "true" : "false";
+        }
+        if (typeof value == "number") {
+            return value > 0 ? "true" : "false";
+        }
+        return value;
+    }
+
     static ParametersVisitor = () =>
         Visitors.ParametersVisitorFactory({
             kwargs: {

src/typing/field_type/list.tsx

@@ -43,6 +43,15 @@ export class List extends FieldType<List> {
         return "";
     }
 
+    parseDefault(value: string | any[]): string {
+        if (Array.isArray(value)) {
+            let result = value.map(this.type.parseDefault).join(", ");
+            if (value.length == 1) result += ",";
+            return result;
+        }
+        return value;
+    }
+
     bind(context: FieldTypeBindingContext): List {
         let result = super.bind(context);
         // TODO: there may be some troubles with field name, as it will be the same as of outer type