REJECTED: $mutable$

[amitu]

By default -- boolean $foo: true is a mutable variable, but it can only be mutated by current module.

$mutable$'s default value is module.

-- boolean $foo: true
$mutable$: module

Mutability scope: package

-- boolean $foo: true
$mutable$: package

Mutability scope: public

This is not a great idea, but we do support it, any package can mutate it.

-- boolean $foo: true
$mutable$: public

Mutability scope: main

Most of the times when you think of using public you actually want to use main.

-- boolean $foo: true
$mutable$: main

When a document foo.ftd is being rendered, it is the main document.

FPM folder special handling

Also the modules in FPM folder of the package where foo.ftd belongs can also mutate $mutable$: main variable.

Or any module imported by FPM modules.

We are doing this because most package level configuration of a package should be done in FPM folder.

[amitu]

We do not this because of ftd.window suggestion. That allows us to create top level components, and such global variables can be passed to that top level component instead.