One thing I noticed as I am both going through the Svelte tutorial again as well as writing a similar one for Ember / <template>, is that {{else}} is is syntactically incoherent.

Everywhere else, we use {{ identifier }} to render a value except for {{else}}.

For consistency, I think we should fix that.
Svelte uses a "continuation" syntax to denote that a block is continuing.

So for us, that would look like this:

{{#if condition}}

{{:else if otherCondition}}

{{:else}}

{{/if}}

which has 0 ambiguity with value-rendering.