How to change filed type from integer to string

using D8. I have a field field_number just in one bundle (a node content type that I called law). Now I found that I need to change the field type; it needs to be of type string and not integer.

I wonder if there is a quick/easy way of using migrate or something similar

I remember that time ago I used VBO in D7 but seems that the PHP option is not available in the D8 version of the module. Like in this case: https://drupal.stackexchange.com/a/28349/5422

I’ll like to try using a hook_update_n on a custom module like in this example: How do I change a field type? but not sure if the the new field (as is created programatically) will be easily available for views and other modules and I don’t want to end with a mess.

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How to change filed type from integer to string

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