Outside $idx: {$idx}{~n}
Outside $len: {$len}{~n}
Outside {?$idx}$idx is true{:else}$idx is false{/$idx}{~n}
Outside {?$len}$len is true{:else}$len is false{/$len}{~n}

{#things}
    Inside Section $idx: {$idx}{~n}
    Inside Section $len: {$len}{~n}
    Inside Section .$idx: {.$idx}{~n}
    Inside Section {?$idx}$idx is true{:else}$idx is false{/$idx}{~n}
    Inside Section {?$len}$len is true{:else}$len is false{/$len}{~n}
    {#.}
        Inside Nested Section $idx: {$idx}{~n}
        Inside Nested Section $len: {$len}{~n}
        Inside Nested Section .$idx: {.$idx}{~n}
        Inside Nested Section {?$idx}$idx is true{:else}$idx is false{/$idx}{~n}
        Inside Nested Section {?$len}$len is true{:else}$len is false{/$len}{~n}
    {/.}
{/things}