NAME
Catmandu::Fix::add_field - add or change the value of a HASH key or ARRAY index
DESCRIPTION
Contrary to set_field, this will create the intermediate structures if they are missing.
SYNOPSIS
# Add a new field 'foo' with value 2
add_field(foo, 2)
# Change the value of 'foo' to 'bar 123'
add_field(foo, 'bar 123')
# Create a deeply nested key
add_field(my.deep.nested.key, hi)
# If the second argument is omitted the field has a null value
add_field(foo)