Description
For now, DotEnv component don't allow null as value and don't type values.
We can type value when reading, with %env(int:foo)%. But if an env var is used more than one time, we have to duplicate type hint at each read.

Can we take that problem (typing at reading) on the other side: typing at declaration, not at reading ?

For null value, it's impossible for now, and that's a problem. Maybe we can have a syntax to allow null at declaration ?

Example
/.env
VAR_INT=!int:12
VAR_FLOAT=!float:12.2
VAR_STRING=!string:foo
VAR_STRING_2=foo
VAR_ALLOW_NULL=!?string:null
VAR_ARRAY=!array:[!int:12, !string:foo]

Problems

As DotEnv is installed for dev env by default, how can we do to parse env var in prod env ?