`RELATIVE_BASE` memory leak

[styleex]

Minimal code:

from dateparser import parse

while True:
    ret = parse('24 august', settings={'RELATIVE_BASE': datetime.now()})

Since for each new relative_base, a new settings object is created and cached, memory grows VERY quickly.

[styleex]

my workaround monkeypatch:

def fix_dateparser_cache():
    import hashlib

    def _get_key(cls, settings=None):
        if not settings:
            return 'default'

        # Remove frequently changing values from cache key
        keys = sorted(['%s-%s' % (key, str(settings[key])) for key in settings if key not in ['RELATIVE_BASE', '_mod_settings']])
        return hashlib.md5(''.join(keys).encode('utf-8')).hexdigest()

    def wrap_new(func):
        def constructor(cls, *args, **kwargs):
            key = cls.get_key(*args, **kwargs)

            instance = func(cls, *args)

            # Registry key needed for regex cache
            # https://github.com/scrapinghub/dateparser/blob/141199b477/dateparser/languages/dictionary.py#L43
            setattr(instance, 'registry_key', key)
            return instance

        return staticmethod(constructor)

    dateparser.conf.Settings.get_key = classmethod(_get_key)
    dateparser.conf.Settings.__new__ = wrap_new(dateparser.conf.Settings.__new__)

[ddutt]

This is a fairly critical bug in my use case too, any idea when this'll be fixed?