String values should evaluate "first" and "last"

[sebastienros]

Same as size there are other pseudo properties strings should evaluate.
And length is one that LiquidJs supports but is not valid.

Here is from the shopify's site:

[jg-rp]

Interestingly, using Shopify/Liquid directly instead of via a Shopify store, we get the following:

require 'liquid'

source = <<~LIQUID
  {% assign b = "one" %}
  size:   {{ b.size }}
  length: {{ b.length }}
  first:  {{ b.first }}
  last:   {{ b.last }}
LIQUID

template = Liquid::Template.parse(source)
puts template.render

output

size:   3
length: 
first:  
last:   

[harttle]

Thank you two for the investigation. I think we can support this feature in liquidjs, people can’t blame us for not returning nil right?

[jg-rp]

See also Shopify/liquid#1881.

[harttle]

Closing as implemented in 10.20.0