Hello! I have a form where user inputs a phone (and other fields). I attach phx-hook to this input only, so it adds some masking for phone. Next, I have an ecto scheme and changeset to validate this input. When user inputs it masked, so validation handle_event function gets it like “+1 234 567 89 00” from params, but in ecto changeset i need to validate: is not empty (so only digits string should exist), starts from some number, the length should be i range and etc. So i create a new field where i delete all non digit symbols from incoming string, and validate this string for all i need. So, if i change input before pass it to changeset, it applies errors in “to_form(changeset)”, but it also changes input value. In other case, I create a new field in changeset, cast and validate it, so initial attrs didn’t change so form value didn’t change too. But it’s hard to relate validation errors from changeset to apply it in UI. How do you solve a problem like this? Did I miss a ready-made solution?