Cannot use .space() with the {tags} option

[WingmanNZ]

I have trying to use the following,

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{'.'+tags.space('.')}

to replace any spaces in the {tags} param with a fullstop.

Currently I get an error in the Format editor

[WingmanNZ]

Doing this seems to hack around the error. but I lose the combining of things such as "Extended Collector's Edition"

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{'.['+tags.join('').space('.')+']'}

[rednoah]

String.space() is only defined for String objects, and not List objects.

e.g.

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".$tags".space('.')

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'.' + tags.join(' ').space('.')