Contains returns true if the given string array (haystack) contains given string (needle).

HasBits checks if sum contains bit by performing a bitwise AND operation between values.

IsDomain checks whether `url`s domain matches the given domain exactly (non-case sensitive) The `domain` string must be fully lowercased.

IsDomains checks whether `url`s domain matches any of the given domains exactly (non-case sensitive) The `domains` map should only contain fully lowercased domains.

IsSubdomainOf checks whether `url` is a subdomain of `parent`.

MimeType turn a vips.ImageType into a MIME type string.

SetFromSlice takes a slice and returns a set (represented as a map of struct{}s).

TruncateString truncates string down to the maximum length with a unicode triple dot if truncation took place.