Cannot create a numeric value attribute option using the REST API

[sidm]

Preconditions

Magento ver. 2.2.5 using the REST API.

Steps to reproduce

1. Make a POST call to http://winninge.nextmp.net/rest/V1/products/attributes/<attribute_name>/options i.e., http://winninge.nextmp.net/rest/V1/products/attributes/Size/options setting the label and value to be a numeric string, for example
   { "option": { "label": "30", "value": "30", "sort_order": 0, "is_default": false, "store_labels": [{ "store_id": 0, "label": "30" }] } }

Expected result

1. Attribute option to be created successfully with a 200 status code

Actual result

1. The API responds with { "message": "Cannot save attribute %1", "parameters": ["size"] } and a 400 status code

This is happening when the attribute is a number, and a number alone. It also happens with floating point numbers, such as 6.5.

[magento-engcom-team]

Hi @sidm. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me {$VERSION} instance

where {$VERSION} is version tags (starting from 2.2.0+) or develop branches (2.2-develop +).
For more details, please, review the Magento Contributor Assistant documentation.

@sidm do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[sidm]

@magento-engcom-team give me 2.2.5 instance

[magento-engcom-team]

Hi @sidm. Thank you for your request. I'm working on Magento 2.2.5 instance for you

[magento-engcom-team]

Hi @sidm, here is your Magento instance.
Admin access: https://i-18009-2-2-5.engcom.dev.magento.com/admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[sidm]

Yes, I was able to reproduce this on the vanilla instance.

Reproduction of Issue on the Vanilla 2.2.5 instance

Steps:

1. I created an attribute named Size
   
2. I added it to the default attribute set
   
3. I created a Bug Verify integration with "All" API permissions
   
4. Verified that the bug occurred using the same POST body as before, received the same error for this body
   {"option":{"label":"30","value":"30","sort_order":0,"is_default":false,"store_labels":[{"store_id":0,"label":"30"}]}}
   Response
   "{"message":"Cannot save attribute %1","parameters":["size"]}"
   with a status code 400
   

Additional Verification

I also verified that the same call worked with a non-numeric value, using this body
{"option":{"label":"test","value":"test","sort_order":0,"is_default":false,"store_labels":[{"store_id":0,"label":"test"}]}} and received a 200 status code

you can see that the "test" attribute option now appears in the attribute

Hi @sidm , thank you for your report.
We've acknowledged the issue and added to our backlog.