Mandatory omit a field if some other field equals some value

[vishal1132]

• [X] I have looked at the documentation here first?
• [X] I have looked at the examples provided that may showcase my question here?

Package version eg. v9, v10:

v10.4.0

Issue, Question or Enhancement:

Mandatory omit a field if some other field is present in the struct already.

Code sample, to showcase or reproduce:

For example-

type A struct{
    B string  
    C string
}

C should definitely not be there if B equals something like "abcd"

[Nikachev]

The excluded_if tag is needed, as opposed to required_if.

[johnnybubonic]

Hello, is excluded_if implemented at all? I am unable to find it in the documentation nor in the source.

[jh125486]

I've added a PR against with #847.