Falsey values are not merged in data

[k0kubun]

$ cat in.haml 
- h1 = { new: true }
- h2 = { data: { old: true } }
%a(data=h1){ h2 , data: { new: nil, old: false } }

$ haml in.haml
<a></a>

$ faml render in.haml
<a data-new data-old></a>

[eagletmt]

It isn't specific to data attributes...

- h1 = { foo: 'should be overwritten' }
- h2 = { foo: nil }
%a{h1, h2}

% haml in.haml
<a></a>
% faml render in.haml
<a foo='should be overwritten'></a>

I have to exclude falsey values after merging all attributes.

[k0kubun]

It isn't specific to data attributes...

😮