Unfortunately, this extension does not work.
{{#number_format:2.7182818284590452353602874713526624977572470936999595749669676|_}}
displays as
2.7182818284590450907955982984276488423347473144531250000000000
instead of
2.7182818284590452353602874713526624977572470936999595749669676
Nicole Sharp (talk) 20:09, 29 March 2021 (UTC)