multiple spaces in expressions cause an error

[damianham]

this works fine

{% assign params_name = "{{ name | underscore }}_params" %}
{% assign hash_name = "{{ name| underscore }}_hash" %}
{% assign create_model_method = "create_{{ name | underscore }}" %}
require "./spec_helper"

but this does not

{% assign params_name =  "{{ name | underscore }}_params" %}
{% assign hash_name =  "{{ name| underscore }}_hash" %}
{% assign create_model_method  =  "create_{{ name | underscore }}" %}
require "./spec_helper"

multiple spaces between tokens