optional part of mask discarded when unmaskedValue contains it

Hi,

For some reason having a variable which contains optional part of a mask it's discarded when loaded, for example:

Having this

`
{example: {number: '982748238992874822998724892932'}}
`

and

`
{{input-mask mask='(999) 999-9999[, (999) 999-9999][, (999) 999-9999][, (999) 999-9999]' unmaskedValue=example.number class='form-control'}}
`

it shows just the non optional part of the mask like if the mask were

`
mask='(999) 999-9999'
`

also noticed by using greedyMask=true it shows the missing parts plus the non fulfilled optional mask