Pre-release spelling
Pre-releases allow the additional spellings of alpha , beta , c , pre , and preview for a , b , rc , rc , and rc respectively. This allows versions such as 1.1alpha1 , 1.1beta2 , or 1.1c3 which normalize to 1.1a1 , 1.1b2 , and 1.1rc3 . In every case the additional spelling should be considered equivalent to their normal forms.