How to substitute . with _ in key names? (replacing common propertynames )

 https://try.jsonata.org/uZgm69Bfy
https://try.jsonata.org/WsfsFGhjE

https://try.jsonata.org/r2GrHYYou
differnec between 2 menthods

(

$dotsToUnderscores := function($obj) {

$each($obj, function($v, $k) {

{ $replace($k, '.', '_'): $type($v) = 'object' ? $dotsToUnderscores($v) : $v}

}) ~> $merge()

};

$dotsToUnderscores($)

)

(

$dotsToUnderscores :=

$each(?, function($v, $k) {

{ $replace($k, '.', '_'): $type($v) = 'object' ? $dotsToUnderscores($v) : $v}

}) ~> $merge;

$dotsToUnderscores($)

)