feat: narrow types

[simPod]

src/AbstractMoney.php

• getSign(): @return int → @return -1|0|1
• compareTo(): @return int → @return -1|0|1

src/Context.php

• getStep(): @return int<1, max> → @return positive-int

src/Context/CashContext.php

• $step param: int<1, max> → positive-int

src/Context/CustomContext.php

• $step param: int<1, max> → positive-int
• isValidStepForScale() $step param: int<1, max> → positive-int
• getScale(): added @return non-negative-int

src/Currency.php

• $numericCode param: int → non-negative-int
• Added @psalm-suppress DocblockTypeContradiction on $defaultFractionDigits < 0 guard

src/IsoCurrencyProvider.php

• $currencyData array: narrowed $numericCode position from int to non-negative-int

src/Money.php

• allocate() $ratios: int[] → non-negative-int[], added @psalm-suppress on $ratio < 0 guard
• allocateWithRemainder() $ratios: int[] → non-negative-int[], added @psalm-suppress on $ratio < 0 guard
• split() $parts: int → positive-int, added @psalm-suppress on $parts < 1 guard
• splitWithRemainder() $parts: int → positive-int, added @psalm-suppress on $parts < 1 guard

src/MoneyComparator.php

• compare(): @return int → @return -1|0|1

like brick/math#108

[BenMorel]

Thank you, @simPod!