Response.age mishandled as datetime instead of int (or timedelta)

[cvrebert]

Environment:

Flask==0.10.1
Werkzeug==0.9.1

Test case:

#/usr/bin/env python2.7
from flask import Flask, Response

app = Flask(__name__)

@app.route('/')
def root():
    resp = Response()
    resp.age = 42
    return resp

if __name__ == "__main__":
    client = app.test_client()
    resp = client.get('/')
    print "age property:", resp.age
    print "Age header:", resp.headers['Age']

Result:

age property: 1970-01-01 00:00:42
Age header: Thu, 01 Jan 1970 00:00:42 GMT

Expected 42 instead in both cases (though personally I'd optimally prefer timedelta(seconds=42) in the former case).
The HTTP spec says (in part; emphasis added):

The Age response-header field conveys the sender's estimate of the amount of time since the response (or its revalidation) was generated at the origin server.
age-value = delta-seconds
Age values are non-negative decimal integers, representing time in seconds.

[untitaker]

Just a heads up, @cvrebert: This can't be fixed in any minor version, so this'll probably get fixed in 1.0 .

[untitaker]

Will be fixed in 1.0.