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In order to enable exact fee calculation for transactions that spend P2PK outputs in the MiniWallet, we enforce the created signatures to have a fixed length (>49.89% probability) by default. With that it is easier to check the created transactions vsize and avoid flaky tests that would appear whenever the signatures R- or S-values are smaller (due to leading zero bytes). Note that to get the total scriptSig size one has to add another 2 bytes, as there is also the OP_PUSHx instruction on the front and the sighash type byte on the back, leading to a final scriptSig size of 73 bytes.