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505d8b52b8
It'd be useful in cases like:
```gjs
get flagNames() {
return this.flags?.map((flag) => flag && `flag-${flag.name}`);
// w/o this change you'd have to handle it here:
// return this.flags?.map((flag) => flag && `flag-${flag.name}`).filter(Boolean).join(" ");
}
<template>
<span class={{concatClass "gadget" this.flagNames}}>
{{! …or here: }}
<span class={{concatClass "gadget" (concatClass this.flagNames)}}>
```
(also: replaces ember's `compact()` with `filter(Boolean)`)
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