perl-bignum-0.53-2.fc35 fails to build in Fedora 35 because the tests fail:

t/bigint.t ..... ok

#   Failed test '$x = 5 makes $x a Math::BigInt'
#   at t/bigrat.t line 16.
#                   'Math::BigRat'
#     doesn't match '(?^:^Math::BigInt)'

#   Failed test '$x = 2 ** 255 makes $x a Math::BigInt'
#   at t/bigrat.t line 22.
#                   'Math::BigRat'
#     doesn't match '(?^:^Math::BigInt)'

    #   Failed test 'the reference type is correct'
    #   at t/bigrat.t line 113.
    #          got: 'Math::BigRat'
    #     expected: 'Math::BigInt'
    # Looks like you failed 1 test of 2.
[...]
Test Summary Report
-------------------
t/bigrat.t   (Wstat: 8192 Tests: 55 Failed: 32)
  Failed tests:  1-2, 26-55
  Non-zero exit status: 32
t/brinfnan.t (Wstat: 6144 Tests: 66 Failed: 24)
  Failed tests:  1, 3, 11, 13, 28, 30, 32, 34, 36, 38, 40
                42, 44, 46, 48, 50, 52, 54, 56, 58, 60
                62, 64, 66
  Non-zero exit status: 24
t/option_l.t (Wstat: 1280 Tests: 19 Failed: 5)
  Failed tests:  2-3, 5-6, 10
  Non-zero exit status: 5
Files=23, Tests=497,  2 wallclock secs ( 0.10 usr  0.08 sys +  2.43 cusr  1.18 csys =  3.79 CPU)
Result: FAIL
Failed 3/23 test programs. 61/497 subtests failed.

A difference between the last passing and failing buildroot is at <https://koschei.fedoraproject.org/build/11230913>. This failure is triggered by upgrading perl-Math-BigInt from 1:1.9998.23-2.fc35 to 1:1.9998.24-1.fc35.