** Use in classes to denote a field that should be dependency injected.
**
** It is the intention that '@Inject' be (re)used as a general purpose facet by many dependency providers in IoC
** and by custom libraries.
** Hence support for the attributes 'id', 'type', and 'optional' is entirely dependent on the individual dependency provider.
**
** Core IoC dependency providers use the '@Inject' facet to:
**
** - inject IoC services
** - inject Log instances
** - mark ctors to use for autobuilding / service creation.
**
@Js
facet class Inject {
** When injecting services, 'id' denotes the qualified ID of the service to inject. (optional)
**
** When injecting 'Log' instances, 'id' denotes the log name. (optional)
const Str? id := null
** When injecting services, 'type' is used to look up the service - which may be different
** (or more specific) than the field type. (optional)
const Type? type := null
** If 'true' and the dependency / service does not exist then injection should fail silently
** without causing an Err.
const Bool optional := false
}
