protected FactoryBase([Required] ISpecification <TParameter> specification, [Required] IFactoryParameterCoercer <TParameter> coercer)
{
this.specification = specification;
this.coercer = coercer;
}
protected FactoryBase([Required] IFactoryParameterCoercer <TParameter> coercer) : this(FactoryDefaults <TParameter> .Always, coercer)
{
}