プロパティーのタイプ (読み取り専用)
Property type determines which of the "value" variable accessors are valid.
For example, only boolValue is valid for SerializedPropertyType.Boolean
Both intValue and longValue are valid for SerializedPropertyType.Integer.
Both floatValue and doubleValue are valid for SerializedPropertyType.Float.
See Also: SerializedPropertyType.