Create a bound helper. Accepts a function that receives the ordered and hash parameters from the template. If a bound property was provided in the template, it will be resolved to its value and any changes to the bound property cause the helper function to be re-run with the updated values.

• params - An array of resolved ordered parameters.
• hash - An object containing the hash parameters.

For example:

• With an unquoted ordered parameter:

  {{x-capitalize foo}}

Assuming foo was set to "bar", the bound helper would receive ["bar"] as its first argument, and an empty hash as its second.

• With a quoted ordered parameter:

  {{x-capitalize "foo"}}

The bound helper would receive ["foo"] as its first argument, and an empty hash as its second.

• With an unquoted hash parameter:

  {{x-repeat "foo" count=repeatCount}}

Assuming that repeatCount resolved to 2, the bound helper would receive ["foo"] as its first argument, and { count: 2 } as its second.