The null-safe fallback helpers from #99 pass values through fromYaml, which
parses every number as float64. Go's "%v" switches float64 to exponential
notation from about 1e6 upwards, so a bare byte count like 1048576 reached
multiplyQuantity as "1.048576e+06" and the render aborted on the suffix check.
Route both the helper's input and its non-integral product through a new
formatNumber helper, which forces decimal notation and trims the padding
zeros again. Strings such as "512Mi" pass through untouched.
Part of #157.
jklein
5cc53b0772